CVE-2026-28780

Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server. If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer.

This issue affects Apache HTTP Server: through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server. If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer. This issue affects Apache HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant web server.

Security Fix(es):

An escalation of privilege bug in various modules in Apache HTTP 2.4.66 and earlier allows local .htaccess authors to read files with the privileges of the httpd user.

Users are recommended to upgrade to version 2.4.67, which fixes this issue.(CVE-2026-24072)

Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server. If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer.

This issue affects Apache HTTP Server: through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-28780)

Allocation of Resources Without Limits or Throttling vulnerability in Apache HTTP Server's  mod_md via OCSP response data.

This issue affects Apache HTTP Server: from 2.4.30 through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-29168)

A NULL pointer dereference in mod_dav_lock in Apache HTTP Server 2.4.66 and earlier may allow an attacker to crash the server with a malicious request.mod_dav_lock is not used internally by mod_dav or mod_dav_fs.

The only known use-case for mod_dav_lock was mod_dav_svn from Apache Subversion earlier than version 1.2.0.

Users are recommended to upgrade to version 2.4.66, which fixes this issue, or remove mod_dav_lock.(CVE-2026-29169)

A timing attack against mod_auth_digest in Apache HTTP Server 2.4.66 allows a bypass of Digest authentication by a remote attacker.

Users are recommended to upgrade to version 2.4.67, which fixes this issue.(CVE-2026-33006)

Buffer Over-read vulnerability in Apache HTTP Server.

This issue affects Apache HTTP Server: through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-34059)

Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant web server.

Security Fix(es):

Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server. If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer.

This issue affects Apache HTTP Server: through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-28780)

Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant web server.

Security Fix(es):

An escalation of privilege bug in various modules in Apache HTTP 2.4.66 and earlier allows local .htaccess authors to read files with the privileges of the httpd user.

Users are recommended to upgrade to version 2.4.67, which fixes this issue.(CVE-2026-24072)

Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server. If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer.

This issue affects Apache HTTP Server: through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-28780)

Allocation of Resources Without Limits or Throttling vulnerability in Apache HTTP Server's  mod_md via OCSP response data.

This issue affects Apache HTTP Server: from 2.4.30 through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-29168)

A NULL pointer dereference in mod_dav_lock in Apache HTTP Server 2.4.66 and earlier may allow an attacker to crash the server with a malicious request.mod_dav_lock is not used internally by mod_dav or mod_dav_fs.

The only known use-case for mod_dav_lock was mod_dav_svn from Apache Subversion earlier than version 1.2.0.

Users are recommended to upgrade to version 2.4.66, which fixes this issue, or remove mod_dav_lock.(CVE-2026-29169)

A timing attack against mod_auth_digest in Apache HTTP Server 2.4.66 allows a bypass of Digest authentication by a remote attacker.

Users are recommended to upgrade to version 2.4.67, which fixes this issue.(CVE-2026-33006)

Buffer Over-read vulnerability in Apache HTTP Server.

This issue affects Apache HTTP Server: through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-34059)

Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant web server.

Security Fix(es):

An escalation of privilege bug in various modules in Apache HTTP 2.4.66 and earlier allows local .htaccess authors to read files with the privileges of the httpd user.

Users are recommended to upgrade to version 2.4.67, which fixes this issue.(CVE-2026-24072)

Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server. If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer.

This issue affects Apache HTTP Server: through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-28780)

Allocation of Resources Without Limits or Throttling vulnerability in Apache HTTP Server's  mod_md via OCSP response data.

This issue affects Apache HTTP Server: from 2.4.30 through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-29168)

A NULL pointer dereference in mod_dav_lock in Apache HTTP Server 2.4.66 and earlier may allow an attacker to crash the server with a malicious request.mod_dav_lock is not used internally by mod_dav or mod_dav_fs.

The only known use-case for mod_dav_lock was mod_dav_svn from Apache Subversion earlier than version 1.2.0.

Users are recommended to upgrade to version 2.4.66, which fixes this issue, or remove mod_dav_lock.(CVE-2026-29169)

A timing attack against mod_auth_digest in Apache HTTP Server 2.4.66 allows a bypass of Digest authentication by a remote attacker.

Users are recommended to upgrade to version 2.4.67, which fixes this issue.(CVE-2026-33006)

Buffer Over-read vulnerability in Apache HTTP Server.

This issue affects Apache HTTP Server: through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-34059)

Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant web server.

Security Fix(es):

An escalation of privilege bug in various modules in Apache HTTP 2.4.66 and earlier allows local .htaccess authors to read files with the privileges of the httpd user.

Users are recommended to upgrade to version 2.4.67, which fixes this issue.(CVE-2026-24072)

Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server. If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer.

This issue affects Apache HTTP Server: through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-28780)

Allocation of Resources Without Limits or Throttling vulnerability in Apache HTTP Server's  mod_md via OCSP response data.

This issue affects Apache HTTP Server: from 2.4.30 through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-29168)

A NULL pointer dereference in mod_dav_lock in Apache HTTP Server 2.4.66 and earlier may allow an attacker to crash the server with a malicious request.mod_dav_lock is not used internally by mod_dav or mod_dav_fs.

The only known use-case for mod_dav_lock was mod_dav_svn from Apache Subversion earlier than version 1.2.0.

Users are recommended to upgrade to version 2.4.66, which fixes this issue, or remove mod_dav_lock.(CVE-2026-29169)

A timing attack against mod_auth_digest in Apache HTTP Server 2.4.66 allows a bypass of Digest authentication by a remote attacker.

Users are recommended to upgrade to version 2.4.67, which fixes this issue.(CVE-2026-33006)

A NULL pointer dereference in the mod_authn_socache in Apache HTTP Server 2.4.66 and earlier allows an unauthenticated remote user to crash a child process in a caching forward proxy configuration.

Users are recommended to upgrade to version 2.4.67, which fixes this issue.(CVE-2026-33007)

HTTP response splitting vulnerability in multiple Apache HTTP Server modules with untrusted or compromised backend servers.

This issue affects Apache HTTP Server: from through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-33523)

Out-of-bounds Read vulnerability in mod_proxy_ajp of

Apache HTTP Server.

This issue affects Apache HTTP Server: through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-33857)

Buffer Over-read vulnerability in Apache HTTP Server.

This issue affects Apache HTTP Server: through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-34059)

The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

Security Fix(es):

• httpd: mod_proxy_ajp: heap-based buffer over-read and memory disclosure in ajp_parse_data() (CVE-2026-34059)

• httpd: mod_proxy_ajp: heap-based buffer over-read due to missing null-termination check (CVE-2026-34032)

• httpd: mod_proxy_ajp: off-by-one out-of-bounds reads in AJP getter functions (CVE-2026-33857)

• httpd: mod_authn_socache: NULL pointer dereference can cause a child process crash (CVE-2026-33007)

• Apache HTTP Server: mod_proxy_ajp: Apache HTTP Server mod_proxy_ajp: Arbitrary code execution via heap-based buffer overflow (CVE-2026-28780)

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 httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

Security Fix(es):

• httpd: mod_proxy_ajp: heap-based buffer over-read and memory disclosure in ajp_parse_data() (CVE-2026-34059)

• httpd: mod_proxy_ajp: heap-based buffer over-read due to missing null-termination check (CVE-2026-34032)

• httpd: mod_proxy_ajp: off-by-one out-of-bounds reads in AJP getter functions (CVE-2026-33857)

• httpd: mod_authn_socache: NULL pointer dereference can cause a child process crash (CVE-2026-33007)

• Apache HTTP Server: mod_proxy_ajp: Apache HTTP Server mod_proxy_ajp: Arbitrary code execution via heap-based buffer overflow (CVE-2026-28780)

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 httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

Security Fix(es):

• httpd: Apache HTTP Server: HTTP/2 DoS by Memory Increase (CVE-2025-53020)

• httpd: mod_proxy_ajp: heap-based buffer over-read and memory disclosure in ajp_parse_data() (CVE-2026-34059)

• httpd: mod_proxy_ajp: heap-based buffer over-read due to missing null-termination check (CVE-2026-34032)

• httpd: mod_proxy_ajp: off-by-one out-of-bounds reads in AJP getter functions (CVE-2026-33857)

• httpd: mod_authn_socache: NULL pointer dereference can cause a child process crash (CVE-2026-33007)

• Apache HTTP Server: mod_proxy_ajp: Apache HTTP Server mod_proxy_ajp: Arbitrary code execution via heap-based buffer overflow (CVE-2026-28780)

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.

Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server. If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer. This issue affects Apache HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

Security Fix(es):

• httpd: mod_proxy_ajp: heap-based buffer over-read and memory disclosure in ajp_parse_data() (CVE-2026-34059)
• httpd: mod_proxy_ajp: heap-based buffer over-read due to missing null-termination check (CVE-2026-34032)
• httpd: mod_proxy_ajp: off-by-one out-of-bounds reads in AJP getter functions (CVE-2026-33857)
• httpd: mod_authn_socache: NULL pointer dereference can cause a child process crash (CVE-2026-33007)
• Apache HTTP Server: mod_proxy_ajp: Apache HTTP Server mod_proxy_ajp: Arbitrary code execution via heap-based buffer overflow (CVE-2026-28780)

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 httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

Security Fix(es):

• httpd: mod_proxy_ajp: heap-based buffer over-read and memory disclosure in ajp_parse_data() (CVE-2026-34059)
• httpd: mod_proxy_ajp: heap-based buffer over-read due to missing null-termination check (CVE-2026-34032)
• httpd: mod_proxy_ajp: off-by-one out-of-bounds reads in AJP getter functions (CVE-2026-33857)
• httpd: mod_authn_socache: NULL pointer dereference can cause a child process crash (CVE-2026-33007)
• Apache HTTP Server: mod_proxy_ajp: Apache HTTP Server mod_proxy_ajp: Arbitrary code execution via heap-based buffer overflow (CVE-2026-28780)

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 httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

Security Fix(es):

• httpd: Apache HTTP Server: HTTP/2 DoS by Memory Increase (CVE-2025-53020)
• httpd: mod_proxy_ajp: heap-based buffer over-read and memory disclosure in ajp_parse_data() (CVE-2026-34059)
• httpd: mod_proxy_ajp: heap-based buffer over-read due to missing null-termination check (CVE-2026-34032)
• httpd: mod_proxy_ajp: off-by-one out-of-bounds reads in AJP getter functions (CVE-2026-33857)
• httpd: mod_authn_socache: NULL pointer dereference can cause a child process crash (CVE-2026-33007)
• Apache HTTP Server: mod_proxy_ajp: Apache HTTP Server mod_proxy_ajp: Arbitrary code execution via heap-based buffer overflow (CVE-2026-28780)

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.

Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server. If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer.

This issue affects Apache HTTP Server: through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.

• CVE-2026-24072: fix mod_rewrite ap_expr privilege escalation in htaccess
• CVE-2026-28780: fix mod_proxy_ajp ajp_msg_check_header buffer over-read
• CVE-2026-29169: fix mod_dav_lock NULL pointer dereference
• CVE-2026-33006: fix mod_auth_digest timing attack
• CVE-2026-33007: fix mod_authn_socache NULL pointer dereference
• CVE-2026-33523: fix HTTP response splitting via status line
• CVE-2026-33857: fix off-by-one OOB reads in AJP getter functions
• CVE-2026-34032: fix ajp_msg_get_string buffer over-read
• CVE-2026-34059: fix ajp_parse_data heap over-read

• CVE-2026-24072: fix mod_rewrite ap_expr privilege escalation in htaccess
• CVE-2026-28780: fix mod_proxy_ajp ajp_msg_check_header buffer over-read
• CVE-2026-29169: fix mod_dav_lock NULL pointer dereference
• CVE-2026-33006: fix mod_auth_digest timing attack
• CVE-2026-33007: fix mod_authn_socache NULL pointer dereference
• CVE-2026-33523: fix HTTP response splitting via status line
• CVE-2026-33857: fix off-by-one OOB reads in AJP getter functions
• CVE-2026-34032: fix ajp_msg_get_string buffer over-read
• CVE-2026-34059: fix ajp_parse_data heap over-read

• CVE-2026-33857: fix length checks in AJP msg_get functions
• CVE-2026-34032: fix ajp_msg_get_string buffer checks
• CVE-2026-34059: fix ajp_parse_data message len check
• CVE-2026-24072: use AP_EXPR_FLAG_RESTRICTED in htaccess
• CVE-2026-29169: mod_dav_lock: use the right dav_lock_discovery
• CVE-2026-33006: mod_auth_digest: use apr_crypto_equals
• CVE-2026-33007: mod_authn_socache: validate URL earlier
• CVE-2026-33523: scan outgoing status line for newlines and controls
• CVE-2026-28780: fix ajp_msg_check_header check

• CVE-2026-24072: fix mod_rewrite ap_expr privilege escalation in htaccess
• CVE-2026-28780: fix mod_proxy_ajp ajp_msg_check_header buffer over-read
• CVE-2026-29169: fix mod_dav_lock NULL pointer dereference
• CVE-2026-33006: fix mod_auth_digest timing attack
• CVE-2026-33007: fix mod_authn_socache NULL pointer dereference
• CVE-2026-33523: fix HTTP response splitting via status line
• CVE-2026-33857: fix off-by-one OOB reads in AJP getter functions
• CVE-2026-34032: fix ajp_msg_get_string buffer over-read
• CVE-2026-34059: fix ajp_parse_data heap over-read

• CVE-2026-28780: heap-based buffer overflow in ajp_msg_check_header() in mod_proxy_ajp when proxying to a malicious AJP backend that returns an oversized response, allowing a 4-byte out-of-bounds write past the heap buffer

• SECURITY UPDATE: mod_proxy_ajp heap buffer over-read in ajp_msg_get_string
  • debian/patches/CVE-2026-34032.patch: add buffer checks in modules/proxy/ajp_msg.c.
  • CVE-2026-34032
• SECURITY UPDATE: AJP getter functions off-by-one out-of-bounds reads
  • debian/patches/CVE-2026-33857.patch: fix length checks in AJP msg_get functions in modules/proxy/ajp_msg.c.
  • CVE-2026-33857
• SECURITY UPDATE: mod_proxy_ajp heap over-read in ajp_parse_data
  • debian/patches/CVE-2026-34059.patch: fix message length check in modules/proxy/ajp_header.c.
  • CVE-2026-34059
• SECURITY UPDATE: mod_authn_socache crash in caching forward proxy
  • debian/patches/CVE-2026-33007.patch: validate URL earlier in modules/aaa/mod_authn_socache.c.
  • CVE-2026-33007
• SECURITY UPDATE: HTTP response splitting via malicious backend status line
  • debian/patches/CVE-2026-33523.patch: scan outgoing status line for newlines and controls in modules/http/http_filters.c.
  • CVE-2026-33523
• SECURITY UPDATE: mod_rewrite elevation of privileges via ap_expr in .htaccess
  • debian/patches/CVE-2026-24072.patch: use AP_EXPR_FLAG_RESTRICTED in htaccess context in modules/mappers/mod_rewrite.c, modules/metadata/mod_setenvif.c, modules/proxy/mod_proxy_fcgi.c.
  • CVE-2026-24072
• SECURITY UPDATE: mod_auth_digest timing attack allowing Digest auth bypass
  • debian/patches/CVE-2026-33006.patch: use apr_crypto_equals (constant- time comparison) for nonce hash and digest checks, add VALID_NONCE validation and MD5_DIGEST_LEN length check in get_digest_rec, in modules/aaa/mod_auth_digest.c. Bumps configure.in apr-util requirement to >= 1.6 (bionic ships 1.6.1).
  • CVE-2026-33006
• SECURITY UPDATE: mod_proxy_ajp ajp_msg_check_header bounds-check fix
  • debian/patches/CVE-2026-28780.patch: tighten the upper-bound check in ajp_msg_check_header() to reserve AJP_HEADER_LEN bytes of headroom in modules/proxy/ajp_msg.c (companion to CVE-2026-33857/34032).
  • CVE-2026-28780

• SECURITY UPDATE: mod_proxy_ajp heap buffer over-read in ajp_msg_get_string
  • debian/patches/CVE-2026-34032.patch: add buffer checks in modules/proxy/ajp_msg.c.
  • CVE-2026-34032
• SECURITY UPDATE: AJP getter functions off-by-one out-of-bounds reads
  • debian/patches/CVE-2026-33857.patch: fix length checks in AJP msg_get functions in modules/proxy/ajp_msg.c.
  • CVE-2026-33857
• SECURITY UPDATE: mod_proxy_ajp heap over-read in ajp_parse_data
  • debian/patches/CVE-2026-34059.patch: fix message length check in modules/proxy/ajp_header.c.
  • CVE-2026-34059
• SECURITY UPDATE: mod_authn_socache crash in caching forward proxy
  • debian/patches/CVE-2026-33007.patch: validate URL earlier in modules/aaa/mod_authn_socache.c.
  • CVE-2026-33007
• SECURITY UPDATE: HTTP response splitting via malicious backend status line
  • debian/patches/CVE-2026-33523.patch: scan outgoing status line for newlines and controls in modules/http/http_filters.c.
  • CVE-2026-33523
• SECURITY UPDATE: mod_rewrite elevation of privileges via ap_expr in .htaccess
  • debian/patches/CVE-2026-24072.patch: use AP_EXPR_FLAG_RESTRICTED in htaccess context in modules/mappers/mod_rewrite.c and modules/metadata/mod_setenvif.c. mod_proxy_fcgi hunk omitted — ProxyFCGISetEnvIf was added in 2.4.26, after this source.
  • CVE-2026-24072
• SECURITY UPDATE: mod_auth_digest timing attack allowing Digest auth bypass
  • debian/patches/CVE-2026-33006.patch: use a constant-time comparison helper for nonce hash and digest checks, add VALID_NONCE validation and MD5_DIGEST_LEN length check in get_digest_rec, in modules/aaa/mod_auth_digest.c. Inline ap_crypto_equals_const_time() replaces apr_crypto_equals (added in apr-util 1.6, not in xenial's apr-util 1.5.4); the upstream apr-util version bump and the apr_crypto.h include are omitted accordingly.
  • CVE-2026-33006
• SECURITY UPDATE: mod_proxy_ajp ajp_msg_check_header bounds-check fix
  • debian/patches/CVE-2026-28780.patch: tighten the upper-bound check in ajp_msg_check_header() to reserve AJP_HEADER_LEN bytes of headroom in modules/proxy/ajp_msg.c (companion to CVE-2026-33857/34032).
  • CVE-2026-28780

• CVE-2026-28780: mod_proxy_ajp: heap-based buffer overflow in ajp_msg_check_header() — message size check did not subtract AJP_HEADER_LEN, letting a crafted AJP reply write 4 bytes past the end of the heap buffer

• CVE-2026-28780: mod_proxy_ajp: heap-based buffer overflow in ajp_msg_check_header() — message size check did not subtract AJP_HEADER_LEN, letting a crafted AJP reply write 4 bytes past the end of the heap buffer

• CVE-2026-28780: mod_proxy_ajp: heap-based buffer overflow in ajp_msg_check_header() — message size check did not subtract AJP_HEADER_LEN, letting a crafted AJP reply write 4 bytes past the end of the heap buffer

• CVE-2026-28780: mod_proxy_ajp 4-byte heap buffer overflow when contacting a malicious AJP backend (off-by-AJP_HEADER_LEN check in ajp_msg_check_header)
• CVE-2026-34059: mod_proxy_ajp heap over-read in ajp_parse_data on short AJP replies
• CVE-2026-33006: mod_auth_digest used non-constant-time strcmp() for nonce-hash and response-digest comparisons; replace with constant-time comparison and validate nonce/digest sizes
• CVE-2026-33857: mod_proxy_ajp off-by-one out-of-bounds reads in ajp_msg_get_uint8/uint16/uint32 and ajp_msg_peek_uint8/uint16 length checks
• CVE-2026-34032: mod_proxy_ajp ajp_msg_get_string: tighten length check to msg->len and verify the NUL terminator is present

• CVE-2026-28780: mod_proxy_ajp 4-byte heap buffer overflow when contacting a malicious AJP backend (off-by-AJP_HEADER_LEN check in ajp_msg_check_header)
• CVE-2026-34059: mod_proxy_ajp heap over-read in ajp_parse_data on short AJP replies
• CVE-2026-33006: mod_auth_digest used non-constant-time strcmp() for nonce-hash and response-digest comparisons; replace with constant-time comparison and validate nonce/digest sizes
• CVE-2026-33857: mod_proxy_ajp off-by-one out-of-bounds reads in ajp_msg_get_uint8/uint16/uint32 and ajp_msg_peek_uint8/uint16 length checks
• CVE-2026-34032: mod_proxy_ajp ajp_msg_get_string: tighten length check to msg->len and verify the NUL terminator is present

• SECURITY UPDATE: heap buffer overflow in mod_proxy_ajp message header length check
  • debian/patches/CVE-2026-28780.patch: account for the AJP header bytes in the incoming-message size check (msglen > max_size - AJP_HEADER_LEN) in ajp_msg_check_header() so a crafted length can no longer let msg->len exceed the allocated buffer and overflow the heap in modules/proxy/ajp_msg.c. Upstream fix d04119e6e591f7b21222e749387a8b39e9092a1b (SVN r1935348).
  • CVE-2026-28780
• SECURITY UPDATE: infinite loop (DoS) in mod_proxy_ftp Retry-After parsing
  • debian/patches/CVE-2026-44186.patch: advance secs_str inside the scan loop (add the missing secs_str++) in proxy_ftp_handler() so the Retry-After number search makes progress instead of spinning forever on a malicious backend FTP response in modules/proxy/mod_proxy_ftp.c. Upstream fix 414de374a06549b2c6710cbcff81c3821379f75c (SVN r1935004).
  • CVE-2026-44186

http2: double free and possible RCE on early reset. (CVE-2026-23918) mod_rewrite elevation of privileges via ap_expr. (CVE-2026-24072) buffer overflow in mod_proxy_ajp via ajp_msg_check_header(). (CVE-2026-28780) mod_md unrestricted OCSP response. (CVE-2026-29168) mod_dav_lock indirect lock crash. (CVE-2026-29169) mod_auth_digest timing attack. (CVE-2026-33006) mod_authn_socache crash. (CVE-2026-33007) HTTP response splitting forwarding malicious status line. (CVE-2026-33523) Off-by-one OOB reads in AJP getter functions. (CVE-2026-33857) Heap Buffer Over-Read Due to Missing Null-Termination Check (ajp_msg_get_string). (CVE-2026-34032) Heap Over-Read and memory disclosure in ajp_parse_data(). (CVE-2026-34059)

These are all security issues fixed in the apache2-2.4.67-1.1 package on the GA media of openSUSE Tumbleweed.

This update for apache2 fixes the following issues

• CVE-2026-23918: http2: double free and possible RCE on early reset (bsc#1263957).
• CVE-2026-24072: mod_rewrite elevation of privileges via ap_expr (bsc#1263935).
• CVE-2026-28780: heap buffer overflow in mod_proxy_ajp via ajp_msg_check_header() (bsc#1264163).
• CVE-2026-29168: allocation of resources without limits in mod_md via OCSP response (bsc#1264150).
• CVE-2026-29169: NULL pointer dereference in mod_dav_lock allows server crash via malicious requests (bsc#1263956).
• CVE-2026-33006: mod_auth_digest timing attack allows bypass of Digest authentication (bsc#1263955).
• CVE-2026-33007: NULL pointer dereference in mod_authn_socache allows unauthenticated remote user to crash a child processes (bsc#1263954).
• CVE-2026-33523: HTTP response splitting forwarding malicious status line (bsc#1263953).
• CVE-2026-33857: off-by-one OOB reads in AJP getter functions (bsc#1263952).
• CVE-2026-34032: heap buffer overread in mod_proxy_ajp due to missing null-termination check (bsc#1263951).
• CVE-2026-34059: heap buffer overread and memory disclosure via ajp_parse_data() (bsc#1263950).

This update for apache2 fixes the following issues

• CVE-2026-23918: http2: double free and possible RCE on early reset (bsc#1263957).
• CVE-2026-24072: mod_rewrite elevation of privileges via ap_expr (bsc#1263935).
• CVE-2026-28780: heap buffer overflow in mod_proxy_ajp via ajp_msg_check_header() (bsc#1264163).
• CVE-2026-29168: allocation of resources without limits in mod_md via OCSP response (bsc#1264150).
• CVE-2026-29169: NULL pointer dereference in mod_dav_lock allows server crash via malicious requests (bsc#1263956).
• CVE-2026-33006: mod_auth_digest timing attack allows bypass of Digest authentication (bsc#1263955).
• CVE-2026-33007: NULL pointer dereference in mod_authn_socache allows unauthenticated remote user to crash a child processes (bsc#1263954).
• CVE-2026-33523: HTTP response splitting forwarding malicious status line (bsc#1263953).
• CVE-2026-33857: off-by-one OOB reads in AJP getter functions (bsc#1263952).
• CVE-2026-34032: heap buffer overread in mod_proxy_ajp due to missing null-termination check (bsc#1263951).
• CVE-2026-34059: heap buffer overread and memory disclosure via ajp_parse_data() (bsc#1263950).

This update for apache2 fixes the following issues

• CVE-2026-23918: http2: double free and possible RCE on early reset (bsc#1263957).
• CVE-2026-24072: mod_rewrite elevation of privileges via ap_expr (bsc#1263935).
• CVE-2026-28780: heap buffer overflow in mod_proxy_ajp via ajp_msg_check_header() (bsc#1264163).
• CVE-2026-29168: allocation of resources without limits in mod_md via OCSP response (bsc#1264150).
• CVE-2026-29169: NULL pointer dereference in mod_dav_lock allows server crash via malicious requests (bsc#1263956).
• CVE-2026-33006: mod_auth_digest timing attack allows bypass of Digest authentication (bsc#1263955).
• CVE-2026-33007: NULL pointer dereference in mod_authn_socache allows unauthenticated remote user to crash a child processes (bsc#1263954).
• CVE-2026-33523: HTTP response splitting forwarding malicious status line (bsc#1263953).
• CVE-2026-33857: off-by-one OOB reads in AJP getter functions (bsc#1263952).
• CVE-2026-34032: heap buffer overread in mod_proxy_ajp due to missing null-termination check (bsc#1263951).
• CVE-2026-34059: heap buffer overread and memory disclosure via ajp_parse_data() (bsc#1263950).

This update for apache2 fixes the following issues

• CVE-2026-23918: http2: double free and possible RCE on early reset (bsc#1263957).
• CVE-2026-24072: mod_rewrite elevation of privileges via ap_expr (bsc#1263935).
• CVE-2026-28780: heap buffer overflow in mod_proxy_ajp via ajp_msg_check_header() (bsc#1264163).
• CVE-2026-29168: allocation of resources without limits in mod_md via OCSP response (bsc#1264150).
• CVE-2026-29169: NULL pointer dereference in mod_dav_lock allows server crash via malicious requests (bsc#1263956).
• CVE-2026-33006: mod_auth_digest timing attack allows bypass of Digest authentication (bsc#1263955).
• CVE-2026-33007: NULL pointer dereference in mod_authn_socache allows unauthenticated remote user to crash a child processes (bsc#1263954).
• CVE-2026-33523: HTTP response splitting forwarding malicious status line (bsc#1263953).
• CVE-2026-33857: off-by-one OOB reads in AJP getter functions (bsc#1263952).
• CVE-2026-34032: heap buffer overread in mod_proxy_ajp due to missing null-termination check (bsc#1263951).
• CVE-2026-34059: heap buffer overread and memory disclosure via ajp_parse_data() (bsc#1263950).

This update for apache2 fixes the following issues

• CVE-2026-23918: http2: double free and possible RCE on early reset (bsc#1263957).
• CVE-2026-24072: mod_rewrite elevation of privileges via ap_expr (bsc#1263935).
• CVE-2026-28780: heap buffer overflow in mod_proxy_ajp via ajp_msg_check_header() (bsc#1264163).
• CVE-2026-29168: allocation of resources without limits in mod_md via OCSP response (bsc#1264150).
• CVE-2026-29169: NULL pointer dereference in mod_dav_lock allows server crash via malicious requests (bsc#1263956).
• CVE-2026-33006: mod_auth_digest timing attack allows bypass of Digest authentication (bsc#1263955).
• CVE-2026-33007: NULL pointer dereference in mod_authn_socache allows unauthenticated remote user to crash a child processes (bsc#1263954).
• CVE-2026-33523: HTTP response splitting forwarding malicious status line (bsc#1263953).
• CVE-2026-33857: off-by-one OOB reads in AJP getter functions (bsc#1263952).
• CVE-2026-34032: heap buffer overread in mod_proxy_ajp due to missing null-termination check (bsc#1263951).
• CVE-2026-34059: heap buffer overread and memory disclosure via ajp_parse_data() (bsc#1263950).

This update for apache2 fixes the following issues

Update to 2.4.66 (jsc#PED-16334):

Security issues:

• CVE-2026-23918: http2: double free and possible RCE on early reset (bsc#1263957).
• CVE-2026-24072: mod_rewrite elevation of privileges via ap_expr (bsc#1263935).
• CVE-2026-28780: heap buffer overflow in mod_proxy_ajp via ajp_msg_check_header() (bsc#1264163).
• CVE-2026-29168: allocation of resources without limits in mod_md via OCSP response (bsc#1264150).
• CVE-2026-29169: NULL pointer dereference in mod_dav_lock allows server crash via malicious requests (bsc#1263956).
• CVE-2026-33006: mod_auth_digest timing attack allows bypass of Digest authentication (bsc#1263955).
• CVE-2026-33007: NULL pointer dereference in mod_authn_socache allows unauthenticated remote user to crash a child processes (bsc#1263954).
• CVE-2026-33523: HTTP response splitting forwarding malicious status line (bsc#1263953).
• CVE-2026-33857: off-by-one OOB reads in AJP getter functions (bsc#1263952).
• CVE-2026-34032: heap buffer overread in mod_proxy_ajp due to missing null-termination check (bsc#1263951).
• CVE-2026-34059: heap buffer overread and memory disclosure via ajp_parse_data() (bsc#1263950).

Non security issue:

• Internal server error on very long URL (bsc#690734).

This update for apache2 fixes the following issues

• CVE-2026-23918: http2: double free and possible RCE on early reset (bsc#1263957).
• CVE-2026-24072: mod_rewrite elevation of privileges via ap_expr (bsc#1263935).
• CVE-2026-28780: heap buffer overflow in mod_proxy_ajp via ajp_msg_check_header() (bsc#1264163).
• CVE-2026-29167: mod_ldap per-dir use-after-free (bsc#1267976).
• CVE-2026-29168: allocation of resources without limits in mod_md via OCSP response (bsc#1264150).
• CVE-2026-29169: NULL pointer dereference in mod_dav_lock allows server crash via malicious requests (bsc#1263956).
• CVE-2026-29170: mod_proxy_ftp XSS (bsc#1267977).
• CVE-2026-33006: mod_auth_digest timing attack allows bypass of Digest authentication (bsc#1263955).
• CVE-2026-33007: NULL pointer dereference in mod_authn_socache allows unauthenticated remote user to crash a child processes (bsc#1263954).
• CVE-2026-33523: HTTP response splitting forwarding malicious status line (bsc#1263953).
• CVE-2026-33857: off-by-one OOB reads in AJP getter functions (bsc#1263952).
• CVE-2026-34032: heap buffer overread in mod_proxy_ajp due to missing null-termination check (bsc#1263951).
• CVE-2026-34059: heap buffer overread and memory disclosure via ajp_parse_data() (bsc#1263950).
• CVE-2026-34355: mod_proxy_html buffer overflow (bsc#1267978).
• CVE-2026-34356: malicious backend servers can lead to a heap-based buffer overflow (bsc#1267955).
• CVE-2026-42535: malicious path manipulation can lead to child process crashes (bsc#1267956).
• CVE-2026-42536: processing untrusted content can lead to a heap-based buffer overflow (bsc#1267962).
• CVE-2026-43951: out-of-bound read in merge_response_headers can cause crash (bsc#1267963).
• CVE-2026-44119: improper privilege management can lead to an unauthorized read (bsc#1267965).
• CVE-2026-44185: Stack Buffer Over-Read in mod_ssl OCSP send_request (bsc#1267969).
• CVE-2026-44186: responses from an attacker-controlled FTP backend can lead to resource exhaustion and a denial of service (bsc#1267970).
• CVE-2026-44631: crafted regular expression can lead to a buffer underwrite (bsc#1267971).
• CVE-2026-48913: file handle exhaustion during request processing in mod_http2 can lead to a use-after-free (bsc#1267972).
• CVE-2026-49975: Fix cookie header accounting against LimitRequestFields (bsc#1267503).

Non security issue:

• Update to 2.4.66 (jsc#PED-16334).