CVE-2026-53793

rsync before 3.5.0 contains a path confinement bypass vulnerability that allows remote clients to escape the intended inner-module root confinement by constructing paths that resolve outside the chroot boundary when the module root contains a /./ boundary marker. Attackers can exploit improper handling of the /./ notation or forge delta-basis transfers referencing xname paths that cross the /./ boundary to gain unauthorized read or write access to files outside the module's subtree.

Rsync is an open source utility that provides fast incremental file transfer. It uses the "rsync algorithm" which provides a very fast method for bringing remote files into sync. It does this by sending just the differences in the files across the link, without requiring that both sets of files are present at one of the ends of the link beforehand.

Security Fix(es):

Rsync version 3.4.2 and prior contain symlink race condition vulnerabilities in path-based system calls including chmod, lchown, utimes, rename, unlink, mkdir, symlink, mknod, link, rmdir, and lstat that allow local attackers to redirect operations to files outside the exported rsync module. Attackers with local filesystem access can exploit the timing window between path resolution and syscall execution by swapping symlinks to apply sender-supplied permissions, ownership, timestamps, or filenames to arbitrary files outside the intended module boundary on rsync daemons configured with 'use chroot = no'.(CVE-2026-43619)

rsync before 3.5.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability in the rrsync restricted shell wrapper that allows authenticated clients to escape enforced directory restrictions by substituting a symlink for a path component after validation but before transfer processing. Attackers can additionally leverage unrestricted flags such as --copy-unsafe-links, -D, and --log-file through rrsync to read or write files outside the permitted directory subtree.(CVE-2026-53783)

rsync before 3.5.0 contains a path traversal vulnerability that allows remote clients to access files outside the intended module root when use chroot is disabled and the module root path or a component of it is a symlink. The daemon calls chdir() to the module root at session initialization without resolving symlinks via realpath() or equivalent, causing subsequent relative-path operations to reference files relative to the symlink target rather than the intended module root, enabling unauthorized file access.(CVE-2026-53784)

rsync before 3.5.0 contains a path traversal vulnerability that allows a malicious sender to write files outside the intended destination directory tree by crafting relative paths with symlink components in --relative mode. The make_path() function follows symlinks pointing outside the destination tree while creating intermediate directories without verifying that created paths remain within the destination boundary, enabling arbitrary file writes on the receiver's filesystem.(CVE-2026-53785)

rsync before 3.5.0 contains a filter rule bypass vulnerability that allows authenticated clients to override module-level filter restrictions by supplying malicious --filter merge file directives. Attackers can inject client-side merge file directives during filter evaluation to introduce rules that supersede daemon module-level restrictions, gaining access to files the module filter was intended to exclude.(CVE-2026-53786)

rsync before 3.5.0 contains a newline injection vulnerability in the name-converter uid/gid mapping interface that allows local attackers to forge protocol messages by creating user or group names containing newline characters. Attackers can inject malicious newline characters into names communicated over the pipe-based line-oriented protocol to cause the rsync daemon to process attacker-influenced data as legitimate protocol input, corrupting uid/gid mapping logic.(CVE-2026-53788)

rsync before 3.5.0 contains an improper path handling vulnerability that allows a malicious sender to expand the scope of --delete operations beyond the intended destination subtree by sending a crafted file list that causes rsync to reclassify implied parent directory entries or treat synthetic paths as the transfer root. Attackers can exploit multiple variants including implied parent reclassification, synthetic root path construction, legacy protocol behavior below version 30, and…

Rsync is an open source utility that provides fast incremental file transfer. It uses the "rsync algorithm" which provides a very fast method for bringing remote files into sync. It does this by sending just the differences in the files across the link, without requiring that both sets of files are present at one of the ends of the link beforehand.

Security Fix(es):

Rsync version 3.4.2 and prior contain symlink race condition vulnerabilities in path-based system calls including chmod, lchown, utimes, rename, unlink, mkdir, symlink, mknod, link, rmdir, and lstat that allow local attackers to redirect operations to files outside the exported rsync module. Attackers with local filesystem access can exploit the timing window between path resolution and syscall execution by swapping symlinks to apply sender-supplied permissions, ownership, timestamps, or filenames to arbitrary files outside the intended module boundary on rsync daemons configured with 'use chroot = no'.(CVE-2026-43619)

rsync before 3.5.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability in the rrsync restricted shell wrapper that allows authenticated clients to escape enforced directory restrictions by substituting a symlink for a path component after validation but before transfer processing. Attackers can additionally leverage unrestricted flags such as --copy-unsafe-links, -D, and --log-file through rrsync to read or write files outside the permitted directory subtree.(CVE-2026-53783)

rsync before 3.5.0 contains a path traversal vulnerability that allows remote clients to access files outside the intended module root when use chroot is disabled and the module root path or a component of it is a symlink. The daemon calls chdir() to the module root at session initialization without resolving symlinks via realpath() or equivalent, causing subsequent relative-path operations to reference files relative to the symlink target rather than the intended module root, enabling unauthorized file access.(CVE-2026-53784)

rsync before 3.5.0 contains a path traversal vulnerability that allows a malicious sender to write files outside the intended destination directory tree by crafting relative paths with symlink components in --relative mode. The make_path() function follows symlinks pointing outside the destination tree while creating intermediate directories without verifying that created paths remain within the destination boundary, enabling arbitrary file writes on the receiver's filesystem.(CVE-2026-53785)

rsync before 3.5.0 contains a filter rule bypass vulnerability that allows authenticated clients to override module-level filter restrictions by supplying malicious --filter merge file directives. Attackers can inject client-side merge file directives during filter evaluation to introduce rules that supersede daemon module-level restrictions, gaining access to files the module filter was intended to exclude.(CVE-2026-53786)

rsync before 3.5.0 contains a newline injection vulnerability in the name-converter uid/gid mapping interface that allows local attackers to forge protocol messages by creating user or group names containing newline characters. Attackers can inject malicious newline characters into names communicated over the pipe-based line-oriented protocol to cause the rsync daemon to process attacker-influenced data as legitimate protocol input, corrupting uid/gid mapping logic.(CVE-2026-53788)

rsync before 3.5.0 contains an improper path handling vulnerability that allows a malicious sender to expand the scope of --delete operations beyond the intended destination subtree by sending a crafted file list that causes rsync to reclassify implied parent directory entries or treat synthetic paths as the transfer root. Attackers can exploit multiple variants including implied parent reclassification, synthetic root path construction, legacy protocol behavior below version 30, and…

Rsync is an open source utility that provides fast incremental file transfer. It uses the "rsync algorithm" which provides a very fast method for bringing remote files into sync. It does this by sending just the differences in the files across the link, without requiring that both sets of files are present at one of the ends of the link beforehand.

Security Fix(es):

Rsync version 3.4.2 and prior contain symlink race condition vulnerabilities in path-based system calls including chmod, lchown, utimes, rename, unlink, mkdir, symlink, mknod, link, rmdir, and lstat that allow local attackers to redirect operations to files outside the exported rsync module. Attackers with local filesystem access can exploit the timing window between path resolution and syscall execution by swapping symlinks to apply sender-supplied permissions, ownership, timestamps, or filenames to arbitrary files outside the intended module boundary on rsync daemons configured with 'use chroot = no'.(CVE-2026-43619)

rsync before 3.5.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability in the rrsync restricted shell wrapper that allows authenticated clients to escape enforced directory restrictions by substituting a symlink for a path component after validation but before transfer processing. Attackers can additionally leverage unrestricted flags such as --copy-unsafe-links, -D, and --log-file through rrsync to read or write files outside the permitted directory subtree.(CVE-2026-53783)

rsync before 3.5.0 contains a path traversal vulnerability that allows remote clients to access files outside the intended module root when use chroot is disabled and the module root path or a component of it is a symlink. The daemon calls chdir() to the module root at session initialization without resolving symlinks via realpath() or equivalent, causing subsequent relative-path operations to reference files relative to the symlink target rather than the intended module root, enabling unauthorized file access.(CVE-2026-53784)

rsync before 3.5.0 contains a path traversal vulnerability that allows a malicious sender to write files outside the intended destination directory tree by crafting relative paths with symlink components in --relative mode. The make_path() function follows symlinks pointing outside the destination tree while creating intermediate directories without verifying that created paths remain within the destination boundary, enabling arbitrary file writes on the receiver's filesystem.(CVE-2026-53785)

rsync before 3.5.0 contains a filter rule bypass vulnerability that allows authenticated clients to override module-level filter restrictions by supplying malicious --filter merge file directives. Attackers can inject client-side merge file directives during filter evaluation to introduce rules that supersede daemon module-level restrictions, gaining access to files the module filter was intended to exclude.(CVE-2026-53786)

rsync before 3.5.0 contains a newline injection vulnerability in the name-converter uid/gid mapping interface that allows local attackers to forge protocol messages by creating user or group names containing newline characters. Attackers can inject malicious newline characters into names communicated over the pipe-based line-oriented protocol to cause the rsync daemon to process attacker-influenced data as legitimate protocol input, corrupting uid/gid mapping logic.(CVE-2026-53788)

rsync before 3.5.0 contains an improper path handling vulnerability that allows a malicious sender to expand the scope of --delete operations beyond the intended destination subtree by sending a crafted file list that causes rsync to reclassify implied parent directory entries or treat synthetic paths as the transfer root. Attackers can exploit multiple variants including implied parent reclassification, synthetic root path construction, legacy protocol behavior below version 30, and…

The rsync utility enables the users to copy and synchronize files locally or across a network. Synchronization with rsync is fast because rsync only sends the differences in files over the network instead of sending whole files. The rsync utility is also used as a mirroring tool.

Security Fix(es):

• rsync: rsync 2.3.3 < 3.5.0 Path Traversal via --partial-dir/--backup-dir Symlink (CVE-2026-70460)

• rsync: rsync: TLS Certificate Validation Bypass allows interception of encrypted sessions (CVE-2026-70454)

• rsync: rsync: Arbitrary file deletion via malicious file list (CVE-2026-53789)

• rsync: rsync < 3.5.0 Command Injection via Multiple Code Paths (CVE-2026-53790)

• rsync: rsync: Memory corruption via crafted file entries (CVE-2026-70458)

• rsync: rsync: Denial of Service via handshake stall (CVE-2026-70464)

• rsync: rsync: Local Privilege Escalation via Symlink Following (CVE-2026-53803)

• rsync: rsync: Unauthorized File Access via Symlink Module Root (CVE-2026-53784)

• rsync: rsync: Authorization bypass via auth users directive parsing (CVE-2026-70463)

• rsync: rsync 3.1.0 < 3.5.0 Access Control Bypass via DNS Resolution Failure (CVE-2026-70452)

• rsync: rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header (CVE-2026-53791)

• rsync: rsync: Arbitrary file write via --temp-dir or --link-dest options (CVE-2026-53795)

• rsync: rsync: Heap Out-of-Bounds Write via crafted argument list (CVE-2026-70456)

• rsync: rsync < 3.5.0 Path Confinement Bypass via /./ Boundary Marker in Chroot Mode (CVE-2026-53793)

• rsync: rsync: Denial of Service via Algorithmic Complexity (CVE-2026-70453)

• rsync: rsync: Memory corruption via out-of-bounds write in size parsing (CVE-2026-70457)

• rsync: rsync: Information disclosure and denial of service via crafted files-from entry (CVE-2026-70461)

• rsync: rsync: Arbitrary File Read via Symlink Following (CVE-2026-53802)

• rsync: rsync: Arbitrary file write via path traversal in --relative mode (CVE-2026-53785)

• rsync: rsync: Directory escape via TOCTOU race condition in rrsync (CVE-2026-53783)

Bug Fix(es) and Enhancement(s):

• Rebase rsync to version 3.2.7 in Rocky Linux9 (JIRA:Rocky Linux-248835)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The rsync utility enables the users to copy and synchronize files locally or across a network. Synchronization with rsync is fast because rsync only sends the differences in files over the network instead of sending whole files. The rsync utility is also used as a mirroring tool.

Security Fix(es):

• rsync: rsync 2.3.3 < 3.5.0 Path Traversal via --partial-dir/--backup-dir Symlink (CVE-2026-70460)

• rsync: rsync: TLS Certificate Validation Bypass allows interception of encrypted sessions (CVE-2026-70454)

• rsync: rsync: Arbitrary file deletion via malicious file list (CVE-2026-53789)

• rsync: rsync < 3.5.0 Command Injection via Multiple Code Paths (CVE-2026-53790)

• rsync: rsync: Memory corruption via crafted file entries (CVE-2026-70458)

• rsync: rsync: Denial of Service via handshake stall (CVE-2026-70464)

• rsync: rsync: Local Privilege Escalation via Symlink Following (CVE-2026-53803)

• rsync: rsync: Unauthorized File Access via Symlink Module Root (CVE-2026-53784)

• rsync: rsync: Authorization bypass via auth users directive parsing (CVE-2026-70463)

• rsync: rsync 3.1.0 < 3.5.0 Access Control Bypass via DNS Resolution Failure (CVE-2026-70452)

• rsync: rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header (CVE-2026-53791)

• rsync: rsync: Arbitrary file write via --temp-dir or --link-dest options (CVE-2026-53795)

• rsync: rsync: Heap Out-of-Bounds Write via crafted argument list (CVE-2026-70456)

• rsync: rsync < 3.5.0 Path Confinement Bypass via /./ Boundary Marker in Chroot Mode (CVE-2026-53793)

• rsync: rsync: Denial of Service via Algorithmic Complexity (CVE-2026-70453)

• rsync: rsync: Denial of Service via Zstandard compression thread exhaustion (CVE-2026-70455)

• rsync: rsync: Memory corruption via out-of-bounds write in size parsing (CVE-2026-70457)

• rsync: rsync: Information disclosure and denial of service via crafted files-from entry (CVE-2026-70461)

• rsync: rsync: Arbitrary File Read via Symlink Following (CVE-2026-53802)

• rsync: rsync: Arbitrary file write via path traversal in --relative mode (CVE-2026-53785)

• rsync: rsync: Directory escape via TOCTOU race condition in rrsync (CVE-2026-53783)

Bug Fix(es) and Enhancement(s):

• Rebase rsync to version 3.5.0 in Rocky Linux10 (JIRA:Rocky Linux-246094)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The rsync utility enables the users to copy and synchronize files locally or across a network. Synchronization with rsync is fast because rsync only sends the differences in files over the network instead of sending whole files. The rsync utility is also used as a mirroring tool.

Security Fix(es):

• rsync: rsync 2.3.3 < 3.5.0 Path Traversal via --partial-dir/--backup-dir Symlink (CVE-2026-70460)

• rsync: rsync: Arbitrary file deletion via malicious file list (CVE-2026-53789)

• rsync: rsync < 3.5.0 Command Injection via Multiple Code Paths (CVE-2026-53790)

• rsync: rsync: Memory corruption via crafted file entries (CVE-2026-70458)

• rsync: rsync: Denial of Service via handshake stall (CVE-2026-70464)

• rsync: rsync: Local Privilege Escalation via Symlink Following (CVE-2026-53803)

• rsync: rsync: Unauthorized File Access via Symlink Module Root (CVE-2026-53784)

• rsync: rsync: Authorization bypass via auth users directive parsing (CVE-2026-70463)

• rsync: rsync 3.1.0 < 3.5.0 Access Control Bypass via DNS Resolution Failure (CVE-2026-70452)

• rsync: rsync: Arbitrary file write via --temp-dir or --link-dest options (CVE-2026-53795)

• rsync: rsync: Heap Out-of-Bounds Write via crafted argument list (CVE-2026-70456)

• rsync: rsync < 3.5.0 Path Confinement Bypass via /./ Boundary Marker in Chroot Mode (CVE-2026-53793)

• rsync: rsync: Denial of Service via Algorithmic Complexity (CVE-2026-70453)

• rsync: rsync: Information disclosure and denial of service via crafted files-from entry (CVE-2026-70461)

• rsync: rsync: Arbitrary File Read via Symlink Following (CVE-2026-53802)

• rsync: rsync: Arbitrary file write via path traversal in --relative mode (CVE-2026-53785)

• rsync: rsync: Directory escape via TOCTOU race condition in rrsync (CVE-2026-53783)

Bug Fix(es) and Enhancement(s):

• Fix latest CVEs in rsync in Rocky Linux8 (JIRA:Rocky Linux-256903)

• rsync-3.1.3-27.el8_10 regression: rsync daemon rejects legitimate cross-device symlinks with EXDEV when use chroot = no (JIRA:Rocky Linux-239553)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

rsync before 3.5.0 contains a path confinement bypass vulnerability that allows remote clients to escape the intended inner-module root confinement by constructing paths that resolve outside the chroot boundary when the module root contains a /./ boundary marker. Attackers can exploit improper handling of the /./ notation or forge delta-basis transfers referencing xname paths that cross the /./ boundary to gain unauthorized read or write access to files outside the module's subtree.

The rsync utility enables the users to copy and synchronize files locally or across a network. Synchronization with rsync is fast because rsync only sends the differences in files over the network instead of sending whole files. The rsync utility is also used as a mirroring tool.

Security Fix(es):

• rsync: rsync 2.3.3 < 3.5.0 Path Traversal via --partial-dir/--backup-dir Symlink (CVE-2026-70460)
• rsync: rsync: TLS Certificate Validation Bypass allows interception of encrypted sessions (CVE-2026-70454)
• rsync: rsync: Arbitrary file deletion via malicious file list (CVE-2026-53789)
• rsync: rsync < 3.5.0 Command Injection via Multiple Code Paths (CVE-2026-53790)
• rsync: rsync: Memory corruption via crafted file entries (CVE-2026-70458)
• rsync: rsync: Denial of Service via handshake stall (CVE-2026-70464)
• rsync: rsync: Local Privilege Escalation via Symlink Following (CVE-2026-53803)
• rsync: rsync: Unauthorized File Access via Symlink Module Root (CVE-2026-53784)
• rsync: rsync: Authorization bypass via auth users directive parsing (CVE-2026-70463)
• rsync: rsync 3.1.0 < 3.5.0 Access Control Bypass via DNS Resolution Failure (CVE-2026-70452)
• rsync: rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header (CVE-2026-53791)
• rsync: rsync: Arbitrary file write via --temp-dir or --link-dest options (CVE-2026-53795)
• rsync: rsync: Heap Out-of-Bounds Write via crafted argument list (CVE-2026-70456)
• rsync: rsync < 3.5.0 Path Confinement Bypass via /./ Boundary Marker in Chroot Mode (CVE-2026-53793)
• rsync: rsync: Denial of Service via Algorithmic Complexity (CVE-2026-70453)
• rsync: rsync: Memory corruption via out-of-bounds write in size parsing (CVE-2026-70457)
• rsync: rsync: Information disclosure and denial of service via crafted files-from entry (CVE-2026-70461)
• rsync: rsync: Arbitrary File Read via Symlink Following (CVE-2026-53802)
• rsync: rsync: Arbitrary file write via path traversal in --relative mode (CVE-2026-53785)
• rsync: rsync: Directory escape via TOCTOU race condition in rrsync (CVE-2026-53783)

Bug Fix(es) and Enhancement(s):

• Rebase rsync to version 3.2.7 in AlmaLinux9 (JIRA:AlmaLinux-248835)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The rsync utility enables the users to copy and synchronize files locally or across a network. Synchronization with rsync is fast because rsync only sends the differences in files over the network instead of sending whole files. The rsync utility is also used as a mirroring tool.

Security Fix(es):

• rsync: rsync 2.3.3 < 3.5.0 Path Traversal via --partial-dir/--backup-dir Symlink (CVE-2026-70460)
• rsync: rsync: TLS Certificate Validation Bypass allows interception of encrypted sessions (CVE-2026-70454)
• rsync: rsync: Arbitrary file deletion via malicious file list (CVE-2026-53789)
• rsync: rsync < 3.5.0 Command Injection via Multiple Code Paths (CVE-2026-53790)
• rsync: rsync: Memory corruption via crafted file entries (CVE-2026-70458)
• rsync: rsync: Denial of Service via handshake stall (CVE-2026-70464)
• rsync: rsync: Local Privilege Escalation via Symlink Following (CVE-2026-53803)
• rsync: rsync: Unauthorized File Access via Symlink Module Root (CVE-2026-53784)
• rsync: rsync: Authorization bypass via auth users directive parsing (CVE-2026-70463)
• rsync: rsync 3.1.0 < 3.5.0 Access Control Bypass via DNS Resolution Failure (CVE-2026-70452)
• rsync: rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header (CVE-2026-53791)
• rsync: rsync: Arbitrary file write via --temp-dir or --link-dest options (CVE-2026-53795)
• rsync: rsync: Heap Out-of-Bounds Write via crafted argument list (CVE-2026-70456)
• rsync: rsync < 3.5.0 Path Confinement Bypass via /./ Boundary Marker in Chroot Mode (CVE-2026-53793)
• rsync: rsync: Denial of Service via Algorithmic Complexity (CVE-2026-70453)
• rsync: rsync: Denial of Service via Zstandard compression thread exhaustion (CVE-2026-70455)
• rsync: rsync: Memory corruption via out-of-bounds write in size parsing (CVE-2026-70457)
• rsync: rsync: Information disclosure and denial of service via crafted files-from entry (CVE-2026-70461)
• rsync: rsync: Arbitrary File Read via Symlink Following (CVE-2026-53802)
• rsync: rsync: Arbitrary file write via path traversal in --relative mode (CVE-2026-53785)
• rsync: rsync: Directory escape via TOCTOU race condition in rrsync (CVE-2026-53783)

Bug Fix(es) and Enhancement(s):

• Rebase rsync to version 3.5.0 in AlmaLinux10 (JIRA:AlmaLinux-246094)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The rsync utility enables the users to copy and synchronize files locally or across a network. Synchronization with rsync is fast because rsync only sends the differences in files over the network instead of sending whole files. The rsync utility is also used as a mirroring tool.

Security Fix(es):

• rsync: rsync 2.3.3 < 3.5.0 Path Traversal via --partial-dir/--backup-dir Symlink (CVE-2026-70460)
• rsync: rsync: Arbitrary file deletion via malicious file list (CVE-2026-53789)
• rsync: rsync < 3.5.0 Command Injection via Multiple Code Paths (CVE-2026-53790)
• rsync: rsync: Memory corruption via crafted file entries (CVE-2026-70458)
• rsync: rsync: Denial of Service via handshake stall (CVE-2026-70464)
• rsync: rsync: Local Privilege Escalation via Symlink Following (CVE-2026-53803)
• rsync: rsync: Unauthorized File Access via Symlink Module Root (CVE-2026-53784)
• rsync: rsync: Authorization bypass via auth users directive parsing (CVE-2026-70463)
• rsync: rsync 3.1.0 < 3.5.0 Access Control Bypass via DNS Resolution Failure (CVE-2026-70452)
• rsync: rsync: Arbitrary file write via --temp-dir or --link-dest options (CVE-2026-53795)
• rsync: rsync: Heap Out-of-Bounds Write via crafted argument list (CVE-2026-70456)
• rsync: rsync < 3.5.0 Path Confinement Bypass via /./ Boundary Marker in Chroot Mode (CVE-2026-53793)
• rsync: rsync: Denial of Service via Algorithmic Complexity (CVE-2026-70453)
• rsync: rsync: Information disclosure and denial of service via crafted files-from entry (CVE-2026-70461)
• rsync: rsync: Arbitrary File Read via Symlink Following (CVE-2026-53802)
• rsync: rsync: Arbitrary file write via path traversal in --relative mode (CVE-2026-53785)
• rsync: rsync: Directory escape via TOCTOU race condition in rrsync (CVE-2026-53783)

Bug Fix(es) and Enhancement(s):

• Fix latest CVEs in rsync in AlmaLinux8 (JIRA:AlmaLinux-256903)
• rsync-3.1.3-27.el8_10 regression: rsync daemon rejects legitimate cross-device symlinks with EXDEV when use chroot = no (JIRA:AlmaLinux-239553)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

rsync before 3.5.0 contains a path confinement bypass vulnerability that allows remote clients to escape the intended inner-module root confinement by constructing paths that resolve outside the chroot boundary when the module root contains a /./ boundary marker. Attackers can exploit improper handling of the /./ notation or forge delta-basis transfers referencing xname paths that cross the /./ boundary to gain unauthorized read or write access to files outside the module's subtree.

• SECURITY UPDATE: symlink attack on the daemon module-root chdir
  • debian/patches/els/0031-CVE-2026-53784.patch: add safe_open_no_attacker_symlinks() in util.c and confine the daemon module-root chdir under use-chroot=no. els/0006 had hardened only the relative branch of change_dir(); the absolute branch was still on a plain chdir(dir)
  • CVE-2026-53784
• SECURITY UPDATE: information disclosure and arbitrary write via symlinks planted on operator-supplied paths
  • debian/patches/els/0032-CVE-2026-53802-CVE-2026-53803.patch: open the secrets file, "pid file", --config, motd, --password-file, --log-file, --write-batch/--read-batch and the filter, merge-file, --exclude-from/--include-from paths through safe_open_no_attacker_symlinks()
  • debian/patches/els/0037-CVE-2026-53802-files-from.patch: the same for --files-from, which is opened in options.c and which upstream converted separately, in 3ee00e00
  • CVE-2026-53802
  • CVE-2026-53803
• SECURITY UPDATE: arbitrary file write via an absolute --temp-dir or --link-dest whose parent is flipped to a symlink mid-operation
  • debian/patches/els/0033-CVE-2026-53795.patch: confine do_rename() and do_link() in syscall.c through an ownership walk on the pinned parent directory fd
  • debian/patches/els/0039-CVE-2026-53795-exdev.patch: confine the same way the copy_file() opens and the do_unlink() that robust_rename() falls back to when the rename returns EXDEV, i.e. when an absolute --temp-dir or --partial-dir is on another filesystem (upstream bf79a2a0)
  • CVE-2026-53795
• These four CVEs were previously assessed as requiring the 3.5.0 path resolution rewrite (54965efc, defd7110, b62d7ed6) and closed Won't Fix. That assessment was wrong for CVE-2026-53784/53802/53803: upstream fixed them on 2026-06-12 in a7c49e93, f2941575, 9bfa07e3 and 62bf55fc, nine days before the rewrite and independent of it. CVE-2026-53795 does depend on the rewrite; els/0033 covers only the two sinks it names and documents what it leaves out
• SECURITY UPDATE: TOCTOU on the non-daemon receiver's destination chdir
  • debian/patches/els/0034-CVE-2026-53796.patch: resolve the operator-named destination through safe_open_no_attacker_symlinks() + fchdir, for both the absolute and the relative branch of change_dir()
  • CVE-2026-53796
• SECURITY UPDATE: path confinement bypass for a daemon module with a /./ inner boundary marker
  • debian/patches/els/0035-CVE-2026-53793.patch: widen the four daemon symlink-confinement gates from "am_daemon && !am_chrooted" to "am_daemon && (!am_chrooted || module_dirlen)" so an inner module root is treated as the trust boundary
  • debian/patches/els/0040-CVE-2026-53793-basis-paths.patch: extend that boundary to the two alternate-basis paths the gates do not reach -- the generator's alt-dest basis stat (upstream 5ed0ab3f) and the peer-supplied basis xname the receiver joins to an operator basedir (upstream db284e22)
  • CVE-2026-53793
• SECURITY UPDATE: symlink race in the non-daemon sender's source traversal
  • debian/patches/els/0036-CVE-2026-53797.patch: open file content through secure_relative_open() anchored at the transfer root under default symlink handling, so a raced parent symlink cannot redirect the read
  • debian/patches/els/0038-CVE-2026-53797-noatime.patch: apply O_NOATIME in secure_relative_open() as do_open() did, so --noatime keeps working on that open (and on the els/0006 daemon-sender one)
  • CVE-2026-53797
• The three above come from openSUSE's backport of the same upstream commits to rsync 3.2.3 (openSUSE:Leap:15.5:Update/rsync.45907, hardening patches 0108, 0107 and 0100). Four further CVEs from this disclosure remain open …

• SECURITY UPDATE: shell metacharacter injection via daemon config hooks and RSYNC_CONNECT_PROG
  • debian/patches/CVE-2026-53790.patch: backport the upstream fix
  • CVE-2026-53790
• SECURITY UPDATE: daemon inner-chroot module path escape in the /./ handling
  • debian/patches/CVE-2026-53793.patch: backport the upstream fix
  • CVE-2026-53793
• SECURITY UPDATE: unbounded hash chain walk in hash_search()
  • debian/patches/CVE-2026-70453.patch: backport the upstream fix
  • CVE-2026-70453
• SECURITY UPDATE: out-of-bounds F_SUM read in hard_link_check()
  • debian/patches/CVE-2026-70458.patch: backport the upstream fix
  • CVE-2026-70458
• SECURITY UPDATE: I/O timeout bypass via MSG_IO_TIMEOUT
  • debian/patches/CVE-2026-70462.patch: backport the upstream fix
  • CVE-2026-70462
• SECURITY UPDATE: unbounded pre-transfer handshake in start_daemon()
  • debian/patches/CVE-2026-70464.patch: backport the upstream fix
  • CVE-2026-70464

• CVE-2026-53793: confine the alt-dest basis stat in try_dests and hard_link_check
• CVE-2026-70458: skip the F_SUM read for ITEM_DELETED in log_formatted

• SECURITY UPDATE: unbounded hash-chain walk in the delta-transfer matcher
  • debian/patches/CVE-2026-70453.patch: bound the hash_search() chain walk in match.c so a crafted checksum set cannot drive quadratic CPU use
  • CVE-2026-70453
• SECURITY UPDATE: peer-supplied I/O timeout accepted as non-positive
  • debian/patches/CVE-2026-70462.patch: reject a non-positive MSG_IO_TIMEOUT from the peer in io.c
  • CVE-2026-70462
• SECURITY UPDATE: unbounded daemon pre-transfer handshake
  • debian/patches/CVE-2026-70464.patch: bound the pre-transfer handshake with a timeout in clientserver.c and io.c
  • CVE-2026-70464
• SECURITY UPDATE: malicious-peer protocol input and checksum-slot lifetime
  • debian/patches/CVE-2026-70458-1.patch: daemon robustness against malicious-peer protocol input
  • debian/patches/CVE-2026-70458-2.patch: guard the F_SUM checksum-slot lifetime in hlink.c and main.c
  • debian/patches/CVE-2026-70458-3-copy-devices.patch: extend the same guard to the copy-devices path
  • CVE-2026-70458
• SECURITY UPDATE: daemon authentication, access and argument hardening
  • debian/patches/CVE-2026-53790-1.patch: harden daemon authentication, access, socket and argument handling
  • debian/patches/CVE-2026-53790-2-shell-chars.patch: confine operator- and peer-supplied paths to the served tree and reject shell metacharacters
  • debian/patches/CVE-2026-53790-3-uninit.patch: fix a safe_arg() uninitialized-byte leak in options.c
  • CVE-2026-53790
• SECURITY UPDATE: inner-module escape for a daemon module using /./
  • debian/patches/CVE-2026-53793-1-basis-paths.patch: stat alternate-basis candidates through the confined resolver in generator.c
  • debian/patches/CVE-2026-53793-2-inner-module.patch: widen the use_secure_symlinks and change_dir() gates from "am_daemon && !am_chrooted" to "am_daemon && (!am_chrooted || module_dirlen)" so an inner module root is the trust boundary, not the kernel chroot
  • CVE-2026-53793

• CVE-2026-53793: confine the alt-dest basis stat in try_dests and hard_link_check
• CVE-2026-70458: skip the F_SUM read for ITEM_DELETED in log_formatted

• CVE-2026-53793: confine the alt-dest basis stat in try_dests and hard_link_check
• CVE-2026-70458: skip the F_SUM read for ITEM_DELETED in log_formatted

• CVE-2026-53793: confine a daemon module whose path carries a "/./" inner boundary marker to the inner module root rather than only to the kernel chroot, by widening the single predicate every confined wrapper, the secure symlink handling and the directory scan test, so a symlink inside the module can no longer reach a sibling that is inside the chroot but outside the module; also sanitize the peer-supplied basis name on the client
• CVE-2026-70454: require CA verification for the gnutls and stunnel backends of the rsync-ssl helper and bind the server certificate to the requested host, so an on-path attacker can no longer present a certificate valid for another name; validate the hostname before it reaches the TLS client
• CVE-2026-70464: bound the peer-driven daemon handshake with an absolute deadline armed before any peer input is read, so an unauthenticated client can no longer hold a connection slot open past "max connections" by stalling the greeting or trickling arguments
• NOTE, behaviour change from the CVE-2026-70454 fix: rsync-ssl is now fail-closed for the backends that could not verify at all. With RSYNC_SSL_TYPE=gnutls or stunnel and RSYNC_SSL_CA_CERT unset the helper exits 1 instead of connecting without verification; set RSYNC_SSL_ALLOW_INSECURE_GNUTLS=1 or RSYNC_SSL_ALLOW_INSECURE_STUNNEL=1 to restore the old behaviour, and RSYNC_SSL_SKIP_HOSTNAME_CHECK=1 to keep CA verification without the hostname binding. The default openssl path is unchanged: it already verified, and still does

• CVE-2026-53793: widen the daemon path-confinement gate to cover a chrooted module whose path carries a "/./" inner boundary marker, and route the resolver trust root and do_mkdir_at through the same predicate
• CVE-2026-53796: confine the non-daemon receiver's destination chdir, refusing a destination symlink owned by another uid while still following the operator's own
• CVE-2026-70452: fail closed when a hosts-deny token cannot be resolved, so a transient DNS failure no longer admits a host the deny list names
• CVE-2026-53783: inode-pin the rrsync-validated path and root the argument handed to rsync at that pinned fd, refuse dangerous options in a restricted directory, add the --drop-D option the restricted receiver needs, and keep restricted-root paths working
• CVE-2026-70460: pin the receiver option directories a peer can pivot through rrsync

• CVE-2026-53790: refuse a shell-active RSYNC_CONNECT_PROG %H host and quote it; escape backtick, newline and carriage return in remote-shell arguments
• CVE-2026-53793: confine a "/./" inner-module chroot: secure opens, change_dir, chmod, rename, delta-basis opens and alt-dest basis stats, resolved with an in-tree-symlink-following walk so in-module symlinks and --link-dest=../dir keep working; also sanitize a fuzzy-basis xname on the client
• CVE-2026-70453: cap the per-offset hash_search() chain walk at MAX_CHAIN_LEN
• CVE-2026-70458: refuse FLAG_HLINKED without -H or on a directory, and skip the checksum basis match for a non-regular hard-linked entry
• CVE-2026-70464: bound the daemon's pre-transfer handshake reads with an absolute deadline and cap daemon argument lists
• CVE-2026-29518: rebuild the module-relative path for the daemon sender's confined open, fixing "file has vanished" for a file fetched by name from a subdirectory of a "use chroot = no" module

• CVE-2026-53790: refuse a shell-active RSYNC_CONNECT_PROG %H host and quote it; escape backtick, newline and carriage return in remote-shell arguments
• CVE-2026-53793: confine a "/./" inner-module chroot: secure opens, change_dir, chmod, rename, delta-basis opens and alt-dest basis stats, resolved with an in-tree-symlink-following walk so in-module symlinks and --link-dest=../dir keep working; also sanitize a fuzzy-basis xname on the client
• CVE-2026-70453: cap the per-offset hash_search() chain walk at MAX_CHAIN_LEN
• CVE-2026-70458: refuse FLAG_HLINKED without -H or on a directory, and skip the checksum basis match for a non-regular hard-linked entry
• CVE-2026-70464: bound the daemon's pre-transfer handshake reads with an absolute deadline and cap daemon argument lists
• CVE-2026-29518: rebuild the module-relative path for the daemon sender's confined open, fixing "file has vanished" for a file fetched by name from a subdirectory of a "use chroot = no" module

• CVE-2026-29518: re-implement the "use chroot = no" confinement after the centos7els fix: every path operation proves its parent directory beneath the pinned module root through /proc/self/fd and runs on it with the *at() calls. In-module symlinks, directories the daemon uid may search but not read, -L/-K and --link-dest=../dir keep working; xattrs, ACLs and timestamps are confined too. Drop CVE-2026-29518-2.patch
• CVE-2026-43619: chmod no longer follows a leaf symlink; CVE-2026-29518: confined calls act on the resolved object with O_NOFOLLOW
• CVE-2026-29518: anchor the receiver's basis open at the pinned working directory and prove it beneath the module, not beneath a root resolved by name
• CVE-2026-53784, CVE-2026-53786, CVE-2026-53793: re-anchor on the re-implemented CVE-2026-29518 confinement

• CVE-2026-29518: re-implement the "use chroot = no" confinement after the centos7els fix: every path operation proves its parent directory beneath the pinned module root through /proc/self/fd and runs on it with the *at() calls. In-module symlinks, directories the daemon uid may search but not read, -L/-K and --link-dest=../dir keep working; xattrs, ACLs and timestamps are confined too. Drop CVE-2026-29518-2.patch
• CVE-2026-43619: chmod no longer follows a leaf symlink; CVE-2026-29518: confined calls act on the resolved object with O_NOFOLLOW
• CVE-2026-29518: anchor the receiver's basis open at the pinned working directory and prove it beneath the module, not beneath a root resolved by name
• CVE-2026-53784, CVE-2026-53786, CVE-2026-53793: re-anchor on the re-implemented CVE-2026-29518 confinement

Several vulnerabilities were discovered in rsync, a fast, versatile, remote (and local) file-copying tool, which could result in local privilege escalation, bypass of intended access restrictions, information disclosure, denial of service or the execution of arbitrary code.

These are all security issues fixed in the rsync-3.5.1-1.1 package on the GA media of openSUSE Tumbleweed.

This update for rsync fixes the following issues:

• CVE-2026-53783: rrsync restricted-directory escape (validation-vs-exec race + unsafe option allowlist) (bsc#1269041).
• CVE-2026-53784: Daemon module-root chdir escape under "use chroot = no" (bsc#1269042).
• CVE-2026-53785: --relative implied-parent creation escapes the destination tree (bsc#1269043).
• CVE-2026-53786: Daemon --filter merge file bypasses the module filter list (bsc#1269044).
• CVE-2026-53788: Daemon name-converter accepts newline-bearing names into its line protocol (bsc#1269046).
• CVE-2026-53789: Malicious sender expands --delete scope by reclassifying an implied parent (bsc#1269047).
• CVE-2026-53790: Command / argument injection via unquoted peer- or host-controlled values (bsc#1269048).
• CVE-2026-53791: PROXY-protocol mode lets a direct client spoof the daemon's source address (bsc#1269049).
• CVE-2026-53792: Receiver-supplied zero checksum block length drives sender matching negative (bsc#1269050).
• CVE-2026-53793: Chroot "/./" inner-module escape via a parent-component symlink (bsc#1269051).
• CVE-2026-53794: Remote peer disables the per-allocation sanity cap via --max-alloc=0 (bsc#1269052).
• CVE-2026-53795: Receiver write escape via an absolute --temp-dir / --link-dest disabling rename/link confinement (bsc#1269053).
• CVE-2026-53796: Non-daemon receiver destination-chdir symlink race (bsc#1269054).
• CVE-2026-53797: Sender source-tree parent-component symlink race -> out-of-tree disclosure (bsc#1269055).
• CVE-2026-53798: Daemon name-converter empty response maps an unknown name to uid/gid 0 (bsc#1269045).
• CVE-2026-53799: Receiver ACL/xattr application follows a symlink-race -> arbitrary ACL set (bsc#1269056).
• CVE-2026-53800: Sender --remove-source-files unlink follows a parent-component symlink race -> arbitrary file deletion outside the source tree (bsc#1269057).
• CVE-2026-53801: Sender/daemon directory-scan enumeration escapes the transfer root / module -> out-of-tree disclosure (bsc#1269058).
• CVE-2026-53802: Arbitrary file read / transfer-shaping via symlinked operator-supplied input files (bsc#1269039).
• CVE-2026-53803: Arbitrary file write / privilege escalation via symlinked operator-supplied output paths (bsc#1269040).
• CVE-2026-70452: hosts deny fails OPEN when a configured hostname cannot be resolved, admitting the host it was meant to block (bsc#1273441).
• CVE-2026-70453: Quadratic CPU exhaustion in hash_search() from a crafted equal-weak-checksum chain (bsc#1273440).
• CVE-2026-70454: rsync-ssl establishes an unauthenticated TLS connection (bsc#1273439).
• CVE-2026-70455: Peer-controlled Zstandard worker exhaustion on an rsync daemon (bsc#1273438).
• CVE-2026-70456: Remote out-of-bounds heap write in read_args() when the argument count lands exactly on maxargs (bsc#1273437).
• CVE-2026-70457: Attacker-chosen-offset write in parse_size_arg() error formatting (bsc#1273436).
• CVE-2026-70458: Out-of-bounds write from a FLAG_HLINKED file entry accepted without -H (bsc#1273435).
• CVE-2026-70459: Per-connection daemon child crash from a crafted first incremental file list with a non-directory transfer root (bsc#1273434).
• CVE-2026-70460: Daemon module-root escape through a peer-supplied --partial-dir / --backup-dir resolving via an in- module symlink (bsc#1273433).
• CVE-2026-70461: Peer-driven one-byte heap out-of-bounds write in add_implied_include() (bsc#1273432).
• CVE-2026-70462: Peer-supplied MSG_IO_TIMEOUT defeats the client's own I/O timeout (bsc#1273431).
• CVE-2026-70463: "auth users" ignores documented comma-only parsing, silently skipping a deny/read-only rule (bsc#1273430).
• CVE-2026-70464: Unauthenticated pre-transfer handshake DoS locks out an rsync daemon module (bsc#1273429).

Root has patched CVE-2026-53793 in the rsync package for Root:Debian:11. Multiple fixed versions available.

This update for rsync fixes the following issues:

• CVE-2026-53783: rrsync restricted-directory escape (bsc#1269041).
• CVE-2026-53784: Daemon module-root chdir escape under "use chroot = no" (bsc#1269042).
• CVE-2026-53785: --relative implied-parent creation escapes the destination tree (bsc#1269043).
• CVE-2026-53786: Daemon --filter merge file bypasses the module filter list (bsc#1269044).
• CVE-2026-53788: Daemon name-converter accepts newline-bearing names into its line protocol (bsc#1269046).
• CVE-2026-53789: Malicious sender expands --delete scope by reclassifying an implied parent (bsc#1269047).
• CVE-2026-53790: Command / argument injection via unquoted peer- or host-controlled values (bsc#1269048).
• CVE-2026-53791: PROXY-protocol mode lets a direct client spoof the daemon's source address (bsc#1269049).
• CVE-2026-53792: Receiver-supplied zero checksum block length drives sender matching negative (bsc#1269050).
• CVE-2026-53793: Chroot "/./" inner-module escape via a parent-component symlink (bsc#1269051).
• CVE-2026-53794: Remote peer disables the per-allocation sanity cap via --max-alloc=0 (bsc#1269052).
• CVE-2026-53795: Receiver write escape via an absolute --temp-dir / --link-dest disabling rename/link confinement (bsc#1269053).
• CVE-2026-53796: Non-daemon receiver destination-chdir symlink race (bsc#1269054).
• CVE-2026-53797: Sender source-tree parent-component symlink race -> out-of-tree disclosure (bsc#1269055).
• CVE-2026-53798: Daemon name-converter empty response maps an unknown name to uid/gid 0 (bsc#1269045).
• CVE-2026-53799: Receiver ACL/xattr application follows a symlink-race -> arbitrary ACL set (bsc#1269056).
• CVE-2026-53800: Sender --remove-source-files unlink follows a parent-component symlink race -> arbitrary file deletion outside the source tree (bsc#1269057).
• CVE-2026-53801: Sender/daemon directory-scan enumeration escapes the transfer root / module -> out-of-tree disclosure (bsc#1269058).
• CVE-2026-53802: Arbitrary file read / transfer-shaping via symlinked operator-supplied input files (bsc#1269039).
• CVE-2026-53803: Arbitrary file write / privilege escalation via symlinked operator-supplied output paths (bsc#1269040).
• CVE-2026-70452: hosts deny fails OPEN when a configured hostname cannot be resolved, admitting the host it was meant to block (bsc#1273441).
• CVE-2026-70453: Quadratic CPU exhaustion in hash_search() from a crafted equal-weak-checksum chain (bsc#1273440).
• CVE-2026-70454: rsync-ssl establishes an unauthenticated TLS connection (bsc#1273439).
• CVE-2026-70455: Peer-controlled Zstandard worker exhaustion on an rsync daemon (bsc#1273438).
• CVE-2026-70456: Remote out-of-bounds heap write in read_args() when the argument count lands exactly on maxargs (bsc#1273437).
• CVE-2026-70457: Attacker-chosen-offset write in parse_size_arg() error formatting (bsc#1273436).
• CVE-2026-70458: Out-of-bounds write from a FLAG_HLINKED file entry accepted without -H (bsc#1273435).
• CVE-2026-70459: Per-connection daemon child crash from a crafted first incremental file list with a non-directory transfer root (bsc#1273434).
• CVE-2026-70460: Daemon module-root escape through a peer-supplied --partial-dir / --backup-dir resolving via an in- module symlink (bsc#1273433).
• CVE-2026-70461: Peer-driven one-byte heap out-of-bounds write in add_implied_include() (bsc#1273432).
• CVE-2026-70462: Peer-supplied MSG_IO_TIMEOUT defeats the client's own I/O timeout (bsc#1273431).
• CVE-2026-70463: "auth users" ignores documented comma-only parsing, silently skipping a deny/read-only rule (bsc#1273430).
• CVE-2026-70464: Unauthenticated pre-transfer handshake DoS locks out an rsync daemon module (bsc#1273429).

This update for rsync fixes the following issues:

• CVE-2026-53783: rrsync restricted-directory escape (validation-vs-exec race + unsafe option allowlist) (bsc#1269041).
• CVE-2026-53784: Daemon module-root chdir escape under "use chroot = no" (bsc#1269042).
• CVE-2026-53785: --relative implied-parent creation escapes the destination tree (bsc#1269043).
• CVE-2026-53786: Daemon --filter merge file bypasses the module filter list (bsc#1269044).
• CVE-2026-53788: Daemon name-converter accepts newline-bearing names into its line protocol (bsc#1269046).
• CVE-2026-53789: Malicious sender expands --delete scope by reclassifying an implied parent (bsc#1269047).
• CVE-2026-53790: Command / argument injection via unquoted peer- or host-controlled values (bsc#1269048).
• CVE-2026-53791: PROXY-protocol mode lets a direct client spoof the daemon's source address (bsc#1269049).
• CVE-2026-53792: Receiver-supplied zero checksum block length drives sender matching negative (bsc#1269050).
• CVE-2026-53793: Chroot "/./" inner-module escape via a parent-component symlink (bsc#1269051).
• CVE-2026-53794: Remote peer disables the per-allocation sanity cap via --max-alloc=0 (bsc#1269052).
• CVE-2026-53795: Receiver write escape via an absolute --temp-dir / --link-dest disabling rename/link confinement (bsc#1269053).
• CVE-2026-53796: Non-daemon receiver destination-chdir symlink race (TOCTOU) (bsc#1269054).
• CVE-2026-53797: Sender source-tree parent-component symlink race -> out-of-tree disclosure (bsc#1269055).
• CVE-2026-53798: Daemon name-converter empty response maps an unknown name to uid/gid 0 (bsc#1269045).
• CVE-2026-53799: Receiver ACL/xattr application follows a symlink-race -> arbitrary ACL set (local privilege escalation) (bsc#1269056).
• CVE-2026-53800: Sender --remove-source-files unlink follows a parent-component symlink race -> arbitrary file deletion outside the source tree (bsc#1269057).
• CVE-2026-53801: Sender/daemon directory-scan enumeration escapes the transfer root / module -> out-of-tree disclosure (bsc#1269058).
• CVE-2026-53802: Arbitrary file read / transfer-shaping via symlinked operator-supplied input files (bsc#1269039).
• CVE-2026-53803: Arbitrary file write / privilege escalation via symlinked operator-supplied output paths (bsc#1269040).
• CVE-2026-70452: hosts deny fails OPEN when a configured hostname cannot be resolved, admitting the host it was meant to block (bsc#1273441).
• CVE-2026-70453: Quadratic CPU exhaustion in hash_search() from a crafted equal-weak-checksum chain (bsc#1273440).
• CVE-2026-70454: rsync-ssl establishes an unauthenticated TLS connection (bsc#1273439).
• CVE-2026-70455: Peer-controlled Zstandard worker exhaustion on an rsync daemon (bsc#1273438).
• CVE-2026-70456: Remote out-of-bounds heap write in read_args() when the argument count lands exactly on maxargs (bsc#1273437).
• CVE-2026-70457: Attacker-chosen-offset write in parse_size_arg() error formatting (bsc#1273436).
• CVE-2026-70458: Out-of-bounds write from a FLAG_HLINKED file entry accepted without -H (bsc#1273435).
• CVE-2026-70459: Per-connection daemon child crash from a crafted first incremental file list with a non-directory transfer root (bsc#1273434).
• CVE-2026-70460: Daemon module-root escape through a peer-supplied --partial-dir / --backup-dir resolving via an in- module symlink (bsc#1273433).
• CVE-2026-70461: Peer-driven one-byte heap out-of-bounds write in add_implied_include() (bsc#1273432).
• CVE-2026-70462: Peer-supplied MSG_IO_TIMEOUT defeats the client's own I/O timeout (bsc#1273431).
• CVE-2026-70463: "auth users" ignores documented comma-only parsing, silently skipping a deny/read-only rule (bsc#1273430).
• CVE-2026-70464: Unauthenticated pre-transfer handshake DoS locks out an rsync daemon module (bsc#1273429).

This update for rsync fixes the following issues:

• CVE-2026-53783: rrsync restricted-directory escape (validation-vs-exec race + unsafe option allowlist) (bsc#1269041).
• CVE-2026-53784: Daemon module-root chdir escape under "use chroot = no" (bsc#1269042).
• CVE-2026-53785: --relative implied-parent creation escapes the destination tree (bsc#1269043).
• CVE-2026-53786: Daemon --filter merge file bypasses the module filter list (bsc#1269044).
• CVE-2026-53788: Daemon name-converter accepts newline-bearing names into its line protocol (bsc#1269046).
• CVE-2026-53789: Malicious sender expands --delete scope by reclassifying an implied parent (bsc#1269047).
• CVE-2026-53790: Command / argument injection via unquoted peer- or host-controlled values (bsc#1269048).
• CVE-2026-53791: PROXY-protocol mode lets a direct client spoof the daemon's source address (bsc#1269049).
• CVE-2026-53792: Receiver-supplied zero checksum block length drives sender matching negative (bsc#1269050).
• CVE-2026-53793: Chroot "/./" inner-module escape via a parent-component symlink (bsc#1269051).
• CVE-2026-53794: Remote peer disables the per-allocation sanity cap via --max-alloc=0 (bsc#1269052).
• CVE-2026-53795: Receiver write escape via an absolute --temp-dir / --link-dest disabling rename/link confinement (bsc#1269053).
• CVE-2026-53796: Non-daemon receiver destination-chdir symlink race (bsc#1269054).
• CVE-2026-53797: Sender source-tree parent-component symlink race -> out-of-tree disclosure (bsc#1269055).
• CVE-2026-53798: Daemon name-converter empty response maps an unknown name to uid/gid 0 (bsc#1269045).
• CVE-2026-53799: Receiver ACL/xattr application follows a symlink-race -> arbitrary ACL set (bsc#1269056).
• CVE-2026-53800: Sender --remove-source-files unlink follows a parent-component symlink race -> arbitrary file deletion outside the source tree (bsc#1269057).
• CVE-2026-53801: Sender/daemon directory-scan enumeration escapes the transfer root / module -> out-of-tree disclosure (bsc#1269058).
• CVE-2026-53802: Arbitrary file read / transfer-shaping via symlinked operator-supplied input files (bsc#1269039).
• CVE-2026-53803: Arbitrary file write / privilege escalation via symlinked operator-supplied output paths (bsc#1269040).
• CVE-2026-70452: hosts deny fails OPEN when a configured hostname cannot be resolved, admitting the host it was meant to block (bsc#1273441).
• CVE-2026-70453: Quadratic CPU exhaustion in hash_search() from a crafted equal-weak-checksum chain (bsc#1273440).
• CVE-2026-70454: rsync-ssl establishes an unauthenticated TLS connection (bsc#1273439).
• CVE-2026-70455: Peer-controlled Zstandard worker exhaustion on an rsync daemon (bsc#1273438).
• CVE-2026-70456: Remote out-of-bounds heap write in read_args() when the argument count lands exactly on maxargs (bsc#1273437).
• CVE-2026-70457: Attacker-chosen-offset write in parse_size_arg() error formatting (bsc#1273436).
• CVE-2026-70458: Out-of-bounds write from a FLAG_HLINKED file entry accepted without -H (bsc#1273435).
• CVE-2026-70459: Per-connection daemon child crash from a crafted first incremental file list with a non-directory transfer root (bsc#1273434).
• CVE-2026-70460: Daemon module-root escape through a peer-supplied --partial-dir / --backup-dir resolving via an in- module symlink (bsc#1273433).
• CVE-2026-70461: Peer-driven one-byte heap out-of-bounds write in add_implied_include() (bsc#1273432).
• CVE-2026-70462: Peer-supplied MSG_IO_TIMEOUT defeats the client's own I/O timeout (bsc#1273431).
• CVE-2026-70463: "auth users" ignores documented comma-only parsing, silently skipping a deny/read-only rule (bsc#1273430).
• CVE-2026-70464: Unauthenticated pre-transfer handshake DoS locks out an rsync daemon module (bsc#1273429).

This update for rsync fixes the following issues:

• CVE-2026-53783: rrsync restricted-directory escape (validation-vs-exec race + unsafe option allowlist) (bsc#1269041).
• CVE-2026-53784: Daemon module-root chdir escape under "use chroot = no" (bsc#1269042).
• CVE-2026-53785: --relative implied-parent creation escapes the destination tree (bsc#1269043).
• CVE-2026-53786: Daemon --filter merge file bypasses the module filter list (bsc#1269044).
• CVE-2026-53788: Daemon name-converter accepts newline-bearing names into its line protocol (bsc#1269046).
• CVE-2026-53789: Malicious sender expands --delete scope by reclassifying an implied parent (bsc#1269047).
• CVE-2026-53790: Command / argument injection via unquoted peer- or host-controlled values (bsc#1269048).
• CVE-2026-53791: PROXY-protocol mode lets a direct client spoof the daemon's source address (bsc#1269049).
• CVE-2026-53792: Receiver-supplied zero checksum block length drives sender matching negative (bsc#1269050).
• CVE-2026-53793: Chroot "/./" inner-module escape via a parent-component symlink (bsc#1269051).
• CVE-2026-53794: Remote peer disables the per-allocation sanity cap via --max-alloc=0 (bsc#1269052).
• CVE-2026-53795: Receiver write escape via an absolute --temp-dir / --link-dest disabling rename/link confinement (bsc#1269053).
• CVE-2026-53796: Non-daemon receiver destination-chdir symlink race (bsc#1269054).
• CVE-2026-53797: Sender source-tree parent-component symlink race -> out-of-tree disclosure (bsc#1269055).
• CVE-2026-53798: Daemon name-converter empty response maps an unknown name to uid/gid 0 (bsc#1269045).
• CVE-2026-53799: Receiver ACL/xattr application follows a symlink-race -> arbitrary ACL set (bsc#1269056).
• CVE-2026-53800: Sender --remove-source-files unlink follows a parent-component symlink race -> arbitrary file deletion outside the source tree (bsc#1269057).
• CVE-2026-53801: Sender/daemon directory-scan enumeration escapes the transfer root / module -> out-of-tree disclosure (bsc#1269058).
• CVE-2026-53802: Arbitrary file read / transfer-shaping via symlinked operator-supplied input files (bsc#1269039).
• CVE-2026-53803: Arbitrary file write / privilege escalation via symlinked operator-supplied output paths (bsc#1269040).
• CVE-2026-70452: hosts deny fails OPEN when a configured hostname cannot be resolved, admitting the host it was meant to block (bsc#1273441).
• CVE-2026-70453: Quadratic CPU exhaustion in hash_search() from a crafted equal-weak-checksum chain (bsc#1273440).
• CVE-2026-70454: rsync-ssl establishes an unauthenticated TLS connection (bsc#1273439).
• CVE-2026-70455: Peer-controlled Zstandard worker exhaustion on an rsync daemon (bsc#1273438).
• CVE-2026-70456: Remote out-of-bounds heap write in read_args() when the argument count lands exactly on maxargs (bsc#1273437).
• CVE-2026-70457: Attacker-chosen-offset write in parse_size_arg() error formatting (bsc#1273436).
• CVE-2026-70458: Out-of-bounds write from a FLAG_HLINKED file entry accepted without -H (bsc#1273435).
• CVE-2026-70459: Per-connection daemon child crash from a crafted first incremental file list with a non-directory transfer root (bsc#1273434).
• CVE-2026-70460: Daemon module-root escape through a peer-supplied --partial-dir / --backup-dir resolving via an in- module symlink (bsc#1273433).
• CVE-2026-70461: Peer-driven one-byte heap out-of-bounds write in add_implied_include() (bsc#1273432).
• CVE-2026-70462: Peer-supplied MSG_IO_TIMEOUT defeats the client's own I/O timeout (bsc#1273431).
• CVE-2026-70463: "auth users" ignores documented comma-only parsing, silently skipping a deny/read-only rule (bsc#1273430).
• CVE-2026-70464: Unauthenticated pre-transfer handshake DoS locks out an rsync daemon module (bsc#1273429).

This update for rsync fixes the following issues:

• CVE-2026-53783: rrsync restricted-directory escape (validation-vs-exec race + unsafe option allowlist) (bsc#1269041).
• CVE-2026-53784: Daemon module-root chdir escape under 'use chroot = no' (bsc#1269042).
• CVE-2026-53785: --relative implied-parent creation escapes the destination tree (bsc#1269043).
• CVE-2026-53786: Daemon --filter merge file bypasses the module filter list (bsc#1269044).
• CVE-2026-53788: Daemon name-converter accepts newline-bearing names into its line protocol (bsc#1269046).
• CVE-2026-53789: Malicious sender expands --delete scope by reclassifying an implied parent (bsc#1269047).
• CVE-2026-53790: Command / argument injection via unquoted peer- or host-controlled values (bsc#1269048).
• CVE-2026-53791: PROXY-protocol mode lets a direct client spoof the daemon's source address (bsc#1269049).
• CVE-2026-53792: Receiver-supplied zero checksum block length drives sender matching negative (bsc#1269050).
• CVE-2026-53793: Chroot '/./' inner-module escape via a parent-component symlink (bsc#1269051).
• CVE-2026-53794: Remote peer disables the per-allocation sanity cap via --max-alloc=0 (bsc#1269052).
• CVE-2026-53795: Receiver write escape via an absolute --temp-dir / --link-dest disabling rename/link confinement (bsc#1269053).
• CVE-2026-53796: Non-daemon receiver destination-chdir symlink race (TOCTOU) (bsc#1269054).
• CVE-2026-53797: Sender source-tree parent-component symlink race -> out-of-tree disclosure (bsc#1269055).
• CVE-2026-53798: Daemon name-converter empty response maps an unknown name to uid/gid 0 (bsc#1269045).
• CVE-2026-53799: Receiver ACL/xattr application follows a symlink-race -> arbitrary ACL set (local privilege escalation) (bsc#1269056).
• CVE-2026-53800: Sender --remove-source-files unlink follows a parent-component symlink race -> arbitrary file deletion outside the source tree (bsc#1269057).
• CVE-2026-53801: Sender/daemon directory-scan enumeration escapes the transfer root / module -> out-of-tree disclosure (bsc#1269058).
• CVE-2026-53802: Arbitrary file read / transfer-shaping via symlinked operator-supplied input files (bsc#1269039).
• CVE-2026-53803: Arbitrary file write / privilege escalation via symlinked operator-supplied output paths (bsc#1269040).
• CVE-2026-70452: hosts deny fails OPEN when a configured hostname cannot be resolved, admitting the host it was meant to block (bsc#1273441).
• CVE-2026-70453: Quadratic CPU exhaustion in hash_search() from a crafted equal-weak-checksum chain (bsc#1273440).
• CVE-2026-70454: rsync-ssl establishes an unauthenticated TLS connection (bsc#1273439).
• CVE-2026-70455: Peer-controlled Zstandard worker exhaustion on an rsync daemon (bsc#1273438).
• CVE-2026-70456: Remote out-of-bounds heap write in read_args() when the argument count lands exactly on maxargs (bsc#1273437).
• CVE-2026-70457: Attacker-chosen-offset write in parse_size_arg() error formatting (bsc#1273436).
• CVE-2026-70458: Out-of-bounds write from a FLAG_HLINKED file entry accepted without -H (bsc#1273435).
• CVE-2026-70459: Per-connection daemon child crash from a crafted first incremental file list with a non-directory transfer root (bsc#1273434).
• CVE-2026-70460: Daemon module-root escape through a peer-supplied --partial-dir / --backup-dir resolving via an in- module symlink (bsc#1273433).
• CVE-2026-70461: Peer-driven one-byte heap out-of-bounds write in add_implied_include() (bsc#1273432).
• CVE-2026-70462: Peer-supplied MSG_IO_TIMEOUT defeats the client's own I/O timeout (bsc#1273431).
• CVE-2026-70463: 'auth users' ignores documented comma-only parsing, silently skipping a deny/read-only rule (bsc#1273430).
• CVE-2026-70464: Unauthenticated pre-transfer handshake DoS locks out an rsync daemon module (bsc#1273429).

This update for rsync fixes the following issues:

• CVE-2026-53783: rrsync restricted-directory escape (validation-vs-exec race + unsafe option allowlist) (bsc#1269041).
• CVE-2026-53784: Daemon module-root chdir escape under 'use chroot = no' (bsc#1269042).
• CVE-2026-53785: --relative implied-parent creation escapes the destination tree (bsc#1269043).
• CVE-2026-53786: Daemon --filter merge file bypasses the module filter list (bsc#1269044).
• CVE-2026-53788: Daemon name-converter accepts newline-bearing names into its line protocol (bsc#1269046).
• CVE-2026-53789: Malicious sender expands --delete scope by reclassifying an implied parent (bsc#1269047).
• CVE-2026-53790: Command / argument injection via unquoted peer- or host-controlled values (bsc#1269048).
• CVE-2026-53791: PROXY-protocol mode lets a direct client spoof the daemon's source address (bsc#1269049).
• CVE-2026-53792: Receiver-supplied zero checksum block length drives sender matching negative (bsc#1269050).
• CVE-2026-53793: Chroot '/./' inner-module escape via a parent-component symlink (bsc#1269051).
• CVE-2026-53794: Remote peer disables the per-allocation sanity cap via --max-alloc=0 (bsc#1269052).
• CVE-2026-53795: Receiver write escape via an absolute --temp-dir / --link-dest disabling rename/link confinement (bsc#1269053).
• CVE-2026-53796: Non-daemon receiver destination-chdir symlink race (TOCTOU) (bsc#1269054).
• CVE-2026-53797: Sender source-tree parent-component symlink race -> out-of-tree disclosure (bsc#1269055).
• CVE-2026-53798: Daemon name-converter empty response maps an unknown name to uid/gid 0 (bsc#1269045).
• CVE-2026-53799: Receiver ACL/xattr application follows a symlink-race -> arbitrary ACL set (local privilege escalation) (bsc#1269056).
• CVE-2026-53800: Sender --remove-source-files unlink follows a parent-component symlink race -> arbitrary file deletion outside the source tree (bsc#1269057).
• CVE-2026-53801: Sender/daemon directory-scan enumeration escapes the transfer root / module -> out-of-tree disclosure (bsc#1269058).
• CVE-2026-53802: Arbitrary file read / transfer-shaping via symlinked operator-supplied input files (bsc#1269039).
• CVE-2026-53803: Arbitrary file write / privilege escalation via symlinked operator-supplied output paths (bsc#1269040).
• CVE-2026-70452: hosts deny fails OPEN when a configured hostname cannot be resolved, admitting the host it was meant to block (bsc#1273441).
• CVE-2026-70453: Quadratic CPU exhaustion in hash_search() from a crafted equal-weak-checksum chain (bsc#1273440).
• CVE-2026-70454: rsync-ssl establishes an unauthenticated TLS connection (bsc#1273439).
• CVE-2026-70455: Peer-controlled Zstandard worker exhaustion on an rsync daemon (bsc#1273438).
• CVE-2026-70456: Remote out-of-bounds heap write in read_args() when the argument count lands exactly on maxargs (bsc#1273437).
• CVE-2026-70457: Attacker-chosen-offset write in parse_size_arg() error formatting (bsc#1273436).
• CVE-2026-70458: Out-of-bounds write from a FLAG_HLINKED file entry accepted without -H (bsc#1273435).
• CVE-2026-70459: Per-connection daemon child crash from a crafted first incremental file list with a non-directory transfer root (bsc#1273434).
• CVE-2026-70460: Daemon module-root escape through a peer-supplied --partial-dir / --backup-dir resolving via an in- module symlink (bsc#1273433).
• CVE-2026-70461: Peer-driven one-byte heap out-of-bounds write in add_implied_include() (bsc#1273432).
• CVE-2026-70462: Peer-supplied MSG_IO_TIMEOUT defeats the client's own I/O timeout (bsc#1273431).
• CVE-2026-70463: 'auth users' ignores documented comma-only parsing, silently skipping a deny/read-only rule (bsc#1273430).
• CVE-2026-70464: Unauthenticated pre-transfer handshake DoS locks out an rsync daemon module (bsc#1273429).