CVE-2026-27447

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, CUPS daemon (cupsd) contains an authorization bypass vulnerability due to case-insensitive username comparison during authorization checks. The vulnerability allows an unprivileged user to gain unauthorized access to restricted operations by using a user with a username that differs only in case from an authorized user. At time of publication, there are no publicly available patches.

CUPS is the standards-based, open source printing system developed by Apple Inc. for UNIX®-like operating systems. CUPS uses the Internet Printing Protocol (IPP) to support printing to local and network printers.

Security Fix(es):

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, CUPS daemon (cupsd) contains an authorization bypass vulnerability due to case-insensitive username comparison during authorization checks. The vulnerability allows an unprivileged user to gain unauthorized access to restricted operations by using a user with a username that differs only in case from an authorized user. At time of publication, there are no publicly available patches.(CVE-2026-27447)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, the RSS notifier allows .. path traversal in notify-recipient-uri (e.g., rss:///../job.cache), letting a remote IPP client write RSS XML bytes outside CacheDir/rss (anywhere that is lp-writable). In particular, because CacheDir is group-writable by default (typically root:lp and mode 0770), the notifier (running as lp) can replace root-managed state files via temp-file + rename(). This PoC clobbers CacheDir/job.cache with RSS XML, and after restarting cupsd the scheduler fails to parse the job cache and previously queued jobs disappear. At time of publication, there are no publicly available patches.(CVE-2026-34978)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, there is a heap-based buffer overflow in the CUPS scheduler when building filter option strings from job attribute. At time of publication, there are no publicly available patches.(CVE-2026-34979)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, in a network-exposed cupsd with a shared target queue, an unauthorized client can send a Print-Job to that shared PostScript queue without authentication. The server accepts a page-border value supplied as textWithoutLanguage, preserves an embedded newline through option escaping and reparse, and then reparses the resulting second-line PPD: text as a trusted scheduler control record. A follow-up raw print job can therefore make the server execute an attacker-chosen existing binary such as /usr/bin/vim as lp. At time of publication, there are no publicly available patches.(CVE-2026-34980)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, a local unprivileged user can coerce cupsd into authenticating to an attacker-controlled localhost IPP service with a reusable Authorization: Local ... token. That token is enough to drive /admin/ requests on localhost, and the attacker can combine CUPS-Create-Local-Printer with printer-is-shared=true to persist a file:///... queue even though the normal FileDevice policy rejects such URIs. Printing to that queue gives an arbitrary root file overwrite; the PoC below uses that primitive to drop a sudoers fragment and demonstrate root command execution. At time of publication, there are no publicly available patches.(CVE-2026-34990)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, an integer underflow vulnerability in _ppdCreateFromIPP() (cups/ppd-cache.c) allows any unprivileged local user to crash the cupsd root process by supplying a negative job-password-supported IPP attribute. The bounds check only caps the upper bound, so a negative value passes validation, is cast to size_t (wrapping to ~2^64), and is used as the length argument to memset() on a 33-byte stack buffer. This causes an immediate SIGSEGV in the cupsd root process. Combined with systemd's Restart=on-failure, an…

CUPS is the standards-based, open source printing system developed by Apple Inc. for UNIX®-like operating systems. CUPS uses the Internet Printing Protocol (IPP) to support printing to local and network printers.

Security Fix(es):

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, CUPS daemon (cupsd) contains an authorization bypass vulnerability due to case-insensitive username comparison during authorization checks. The vulnerability allows an unprivileged user to gain unauthorized access to restricted operations by using a user with a username that differs only in case from an authorized user. At time of publication, there are no publicly available patches.(CVE-2026-27447)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, the RSS notifier allows .. path traversal in notify-recipient-uri (e.g., rss:///../job.cache), letting a remote IPP client write RSS XML bytes outside CacheDir/rss (anywhere that is lp-writable). In particular, because CacheDir is group-writable by default (typically root:lp and mode 0770), the notifier (running as lp) can replace root-managed state files via temp-file + rename(). This PoC clobbers CacheDir/job.cache with RSS XML, and after restarting cupsd the scheduler fails to parse the job cache and previously queued jobs disappear. At time of publication, there are no publicly available patches.(CVE-2026-34978)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, there is a heap-based buffer overflow in the CUPS scheduler when building filter option strings from job attribute. At time of publication, there are no publicly available patches.(CVE-2026-34979)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, in a network-exposed cupsd with a shared target queue, an unauthorized client can send a Print-Job to that shared PostScript queue without authentication. The server accepts a page-border value supplied as textWithoutLanguage, preserves an embedded newline through option escaping and reparse, and then reparses the resulting second-line PPD: text as a trusted scheduler control record. A follow-up raw print job can therefore make the server execute an attacker-chosen existing binary such as /usr/bin/vim as lp. At time of publication, there are no publicly available patches.(CVE-2026-34980)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, a local unprivileged user can coerce cupsd into authenticating to an attacker-controlled localhost IPP service with a reusable Authorization: Local ... token. That token is enough to drive /admin/ requests on localhost, and the attacker can combine CUPS-Create-Local-Printer with printer-is-shared=true to persist a file:///... queue even though the normal FileDevice policy rejects such URIs. Printing to that queue gives an arbitrary root file overwrite; the PoC below uses that primitive to drop a sudoers fragment and demonstrate root command execution. At time of publication, there are no publicly available patches.(CVE-2026-34990)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, an integer underflow vulnerability in _ppdCreateFromIPP() (cups/ppd-cache.c) allows any unprivileged local user to crash the cupsd root process by supplying a negative job-password-supported IPP attribute. The bounds check only caps the upper bound, so a negative value passes validation, is cast to size_t (wrapping to ~2^64), and is used as the length argument to memset() on a 33-byte stack buffer. This causes an immediate SIGSEGV in the cupsd root process. Combined with systemd's Restart=on-failure, an…

CUPS is the standards-based, open source printing system developed by Apple Inc. for UNIX®-like operating systems. CUPS uses the Internet Printing Protocol (IPP) to support printing to local and network printers.

Security Fix(es):

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, CUPS daemon (cupsd) contains an authorization bypass vulnerability due to case-insensitive username comparison during authorization checks. The vulnerability allows an unprivileged user to gain unauthorized access to restricted operations by using a user with a username that differs only in case from an authorized user. At time of publication, there are no publicly available patches.(CVE-2026-27447)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, the RSS notifier allows .. path traversal in notify-recipient-uri (e.g., rss:///../job.cache), letting a remote IPP client write RSS XML bytes outside CacheDir/rss (anywhere that is lp-writable). In particular, because CacheDir is group-writable by default (typically root:lp and mode 0770), the notifier (running as lp) can replace root-managed state files via temp-file + rename(). This PoC clobbers CacheDir/job.cache with RSS XML, and after restarting cupsd the scheduler fails to parse the job cache and previously queued jobs disappear. At time of publication, there are no publicly available patches.(CVE-2026-34978)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, there is a heap-based buffer overflow in the CUPS scheduler when building filter option strings from job attribute. At time of publication, there are no publicly available patches.(CVE-2026-34979)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, in a network-exposed cupsd with a shared target queue, an unauthorized client can send a Print-Job to that shared PostScript queue without authentication. The server accepts a page-border value supplied as textWithoutLanguage, preserves an embedded newline through option escaping and reparse, and then reparses the resulting second-line PPD: text as a trusted scheduler control record. A follow-up raw print job can therefore make the server execute an attacker-chosen existing binary such as /usr/bin/vim as lp. At time of publication, there are no publicly available patches.(CVE-2026-34980)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, a local unprivileged user can coerce cupsd into authenticating to an attacker-controlled localhost IPP service with a reusable Authorization: Local ... token. That token is enough to drive /admin/ requests on localhost, and the attacker can combine CUPS-Create-Local-Printer with printer-is-shared=true to persist a file:///... queue even though the normal FileDevice policy rejects such URIs. Printing to that queue gives an arbitrary root file overwrite; the PoC below uses that primitive to drop a sudoers fragment and demonstrate root command execution. At time of publication, there are no publicly available patches.(CVE-2026-34990)

CUPS is the standards-based, open source printing system developed by Apple Inc. for UNIX®-like operating systems. CUPS uses the Internet Printing Protocol (IPP) to support printing to local and network printers.

Security Fix(es):

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, CUPS daemon (cupsd) contains an authorization bypass vulnerability due to case-insensitive username comparison during authorization checks. The vulnerability allows an unprivileged user to gain unauthorized access to restricted operations by using a user with a username that differs only in case from an authorized user. At time of publication, there are no publicly available patches.(CVE-2026-27447)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, the RSS notifier allows .. path traversal in notify-recipient-uri (e.g., rss:///../job.cache), letting a remote IPP client write RSS XML bytes outside CacheDir/rss (anywhere that is lp-writable). In particular, because CacheDir is group-writable by default (typically root:lp and mode 0770), the notifier (running as lp) can replace root-managed state files via temp-file + rename(). This PoC clobbers CacheDir/job.cache with RSS XML, and after restarting cupsd the scheduler fails to parse the job cache and previously queued jobs disappear. At time of publication, there are no publicly available patches.(CVE-2026-34978)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, there is a heap-based buffer overflow in the CUPS scheduler when building filter option strings from job attribute. At time of publication, there are no publicly available patches.(CVE-2026-34979)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, in a network-exposed cupsd with a shared target queue, an unauthorized client can send a Print-Job to that shared PostScript queue without authentication. The server accepts a page-border value supplied as textWithoutLanguage, preserves an embedded newline through option escaping and reparse, and then reparses the resulting second-line PPD: text as a trusted scheduler control record. A follow-up raw print job can therefore make the server execute an attacker-chosen existing binary such as /usr/bin/vim as lp. At time of publication, there are no publicly available patches.(CVE-2026-34980)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, a local unprivileged user can coerce cupsd into authenticating to an attacker-controlled localhost IPP service with a reusable Authorization: Local ... token. That token is enough to drive /admin/ requests on localhost, and the attacker can combine CUPS-Create-Local-Printer with printer-is-shared=true to persist a file:///... queue even though the normal FileDevice policy rejects such URIs. Printing to that queue gives an arbitrary root file overwrite; the PoC below uses that primitive to drop a sudoers fragment and demonstrate root command execution. At time of publication, there are no publicly available patches.(CVE-2026-34990)

CUPS is the standards-based, open source printing system developed by Apple Inc. for UNIX®-like operating systems. CUPS uses the Internet Printing Protocol (IPP) to support printing to local and network printers.

Security Fix(es):

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, CUPS daemon (cupsd) contains an authorization bypass vulnerability due to case-insensitive username comparison during authorization checks. The vulnerability allows an unprivileged user to gain unauthorized access to restricted operations by using a user with a username that differs only in case from an authorized user. At time of publication, there are no publicly available patches.(CVE-2026-27447)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, the RSS notifier allows .. path traversal in notify-recipient-uri (e.g., rss:///../job.cache), letting a remote IPP client write RSS XML bytes outside CacheDir/rss (anywhere that is lp-writable). In particular, because CacheDir is group-writable by default (typically root:lp and mode 0770), the notifier (running as lp) can replace root-managed state files via temp-file + rename(). This PoC clobbers CacheDir/job.cache with RSS XML, and after restarting cupsd the scheduler fails to parse the job cache and previously queued jobs disappear. At time of publication, there are no publicly available patches.(CVE-2026-34978)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, there is a heap-based buffer overflow in the CUPS scheduler when building filter option strings from job attribute. At time of publication, there are no publicly available patches.(CVE-2026-34979)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, in a network-exposed cupsd with a shared target queue, an unauthorized client can send a Print-Job to that shared PostScript queue without authentication. The server accepts a page-border value supplied as textWithoutLanguage, preserves an embedded newline through option escaping and reparse, and then reparses the resulting second-line PPD: text as a trusted scheduler control record. A follow-up raw print job can therefore make the server execute an attacker-chosen existing binary such as /usr/bin/vim as lp. At time of publication, there are no publicly available patches.(CVE-2026-34980)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, a local unprivileged user can coerce cupsd into authenticating to an attacker-controlled localhost IPP service with a reusable Authorization: Local ... token. That token is enough to drive /admin/ requests on localhost, and the attacker can combine CUPS-Create-Local-Printer with printer-is-shared=true to persist a file:///... queue even though the normal FileDevice policy rejects such URIs. Printing to that queue gives an arbitrary root file overwrite; the PoC below uses that primitive to drop a sudoers fragment and demonstrate root command execution. At time of publication, there are no publicly available patches.(CVE-2026-34990)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, an integer underflow vulnerability in _ppdCreateFromIPP() (cups/ppd-cache.c) allows any unprivileged local user to crash the cupsd root process by supplying a negative job-password-supported IPP attribute. The bounds check only caps the upper bound, so a negative value passes validation, is cast to size_t (wrapping to ~2^64), and is used as the length argument to memset() on a 33-byte stack buffer. This causes an immediate SIGSEGV in the cupsd root process. Combined with systemd's Restart=on-failure, an…

CUPS is the standards-based, open source printing system developed by Apple Inc. for UNIX®-like operating systems. CUPS uses the Internet Printing Protocol (IPP) to support printing to local and network printers.

Security Fix(es):

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, CUPS daemon (cupsd) contains an authorization bypass vulnerability due to case-insensitive username comparison during authorization checks. The vulnerability allows an unprivileged user to gain unauthorized access to restricted operations by using a user with a username that differs only in case from an authorized user. At time of publication, there are no publicly available patches.(CVE-2026-27447)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, the RSS notifier allows .. path traversal in notify-recipient-uri (e.g., rss:///../job.cache), letting a remote IPP client write RSS XML bytes outside CacheDir/rss (anywhere that is lp-writable). In particular, because CacheDir is group-writable by default (typically root:lp and mode 0770), the notifier (running as lp) can replace root-managed state files via temp-file + rename(). This PoC clobbers CacheDir/job.cache with RSS XML, and after restarting cupsd the scheduler fails to parse the job cache and previously queued jobs disappear. At time of publication, there are no publicly available patches.(CVE-2026-34978)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, there is a heap-based buffer overflow in the CUPS scheduler when building filter option strings from job attribute. At time of publication, there are no publicly available patches.(CVE-2026-34979)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, in a network-exposed cupsd with a shared target queue, an unauthorized client can send a Print-Job to that shared PostScript queue without authentication. The server accepts a page-border value supplied as textWithoutLanguage, preserves an embedded newline through option escaping and reparse, and then reparses the resulting second-line PPD: text as a trusted scheduler control record. A follow-up raw print job can therefore make the server execute an attacker-chosen existing binary such as /usr/bin/vim as lp. At time of publication, there are no publicly available patches.(CVE-2026-34980)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, a local unprivileged user can coerce cupsd into authenticating to an attacker-controlled localhost IPP service with a reusable Authorization: Local ... token. That token is enough to drive /admin/ requests on localhost, and the attacker can combine CUPS-Create-Local-Printer with printer-is-shared=true to persist a file:///... queue even though the normal FileDevice policy rejects such URIs. Printing to that queue gives an arbitrary root file overwrite; the PoC below uses that primitive to drop a sudoers fragment and demonstrate root command execution. At time of publication, there are no publicly available patches.(CVE-2026-34990)

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, an integer underflow vulnerability in _ppdCreateFromIPP() (cups/ppd-cache.c) allows any unprivileged local user to crash the cupsd root process by supplying a negative job-password-supported IPP attribute. The bounds check only caps the upper bound, so a negative value passes validation, is cast to size_t (wrapping to ~2^64), and is used as the length argument to memset() on a 33-byte stack buffer. This causes an immediate SIGSEGV in the cupsd root process. Combined with systemd's Restart=on-failure, an…

Root has patched CVE-2026-27447 in the cups package for Root:Debian:12. Multiple fixed versions available.

Root has patched CVE-2026-27447 in the cups package for Root:Debian:13. Multiple fixed versions available.

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, CUPS daemon (cupsd) contains an authorization bypass vulnerability due to case-insensitive username comparison during authorization checks. The vulnerability allows an unprivileged user to gain unauthorized access to restricted operations by using a user with a username that differs only in case from an authorized user. At time of publication, there are no publicly available patches.

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, CUPS daemon (cupsd) contains an authorization bypass vulnerability due to case-insensitive username comparison during authorization checks. The vulnerability allows an unprivileged user to gain unauthorized access to restricted operations by using a user with a username that differs only in case from an authorized user. At time of publication, there are no publicly available patches.

• CVE-2026-27447: fix authorization bypass via case-insensitive username comparison in scheduler

• CVE-2026-27447: fix authorization bypass via case-insensitive username comparison in scheduler

• SECURITY UPDATE: fix authorization bypass in cupsd caused by case-insensitive comparison of local user and group names.
  • debian/patches/CVE-2026-27447.patch: compare usernames against the canonical pw_name from getpwnam() with strcmp() in cupsdCheckGroup() and cupsdIsAuthorized() in scheduler/auth.c; include the upstream follow-up "Fix unauthenticated print policies" (Issue #1557) so CUPSD_AUTH_NONE policies still match users that do not have a local account.
  • CVE-2026-27447.

• CVE-2026-27447: fix authorization bypass via case-insensitive username comparison in scheduler

• CVE-2026-27447: fix authorization bypass via case-insensitive username comparison in scheduler

• CVE-2026-27447: fix authorization bypass via case-insensitive username comparison in scheduler

• CVE-2026-27447: fix authorization bypass in cupsd by replacing case-insensitive username comparisons with byte-exact strcmp against pw->pw_name; also include upstream follow-up commit 849fba7d ("Fix unauthenticated print policies", Issue #1557) to restore behavior for CUPSD_AUTH_NONE policies with named ACLs

• CVE-2026-27447: fix authorization bypass in cupsd caused by case-insensitive comparison of local user and group names; include upstream Issue #1557 follow-up to avoid breaking AuthType None policies for non-local accounts

CVE-2026-27447, Authorization bypass via case-insensitive group-member lookup. CVE-2026-39314, Integer underflow in _ppdCreateFromIPP causes root cupsd crash via negative job-password-supported CVE-2026-39316, Use-after-free in cupsdDeleteTemporaryPrinters via dangling subscription pointer CVE-2026-34978, Path traversal in RSS notify-recipient-uri enables file write outside CacheDir/rss (and clobbering of job.cache) CVE-2026-34979, Heap overflow in get_options() CVE-2026-34980, Shared PostScript queue lets anonymous Print-Job requests reach lpcode execution over the network CVE-2026-34990, Local print admin token disclosure using temporary printers. Heap out-of-bounds read in SNMP supply-level polling leaks stack memory to authenticated users. Out-of-bounds heap read in cupsdSetPrinterAttr marker-types parsing

These are all security issues fixed in the cups-2.4.17-1.1 package on the GA media of openSUSE Tumbleweed.

This update for cups fixes the following issues

• CVE-2026-27447: Authorization bypass via case-insensitive group-member lookup (bsc#1261572).
• CVE-2026-34978: Path traversal in RSS notify-recipient-uri enables file write outside CacheDir/rss (bsc#1261571).
• CVE-2026-34979: Heap overflow in get_options() (bsc#1261570).
• CVE-2026-34980: Shared PostScript queue lets anonymous Print-Job requests reach lp code execution over the network (bsc#1261569).
• CVE-2026-34990: Local print admin token disclosure using temporary printers (bsc#1261568).
• CVE-2026-39314: negative job-password-supported attribute can lead to a denial of service (bsc#1261743).
• CVE-2026-39316: dangling subscription pointer can lead to a denial of service (bsc#1261742).
• CVE-2026-41079: crafted SNMP response can lead to stack-based out-of-bounds read and sensitive memory disclosure (bsc#1263116).

Changes for cups:

• Version upgrade to 2.4.19.

• Version upgrade to 2.4.18.

• Version upgrade to 2.4.17:

• The scheduler followed symbolic links when cleaning out its temporary directory (Issue #1448)
• Updated cupsFileGetConf and cupsFilePutConf to escape more characters.
• Updated man page cancel (Issue #984)
• Updated cupsRasterReadHeader to validate more of the page header values (Issue #1501)
• Fixed an issue with the class/printer CGI name checking.
• Fixed infinite loop in http_write() on busy print servers (Issue #827)
• Fixed potential TLS blocking issues (Issue #1128)
• Fixed a job history bug in the scheduler (Issue #1440)
• Fixed notifier logging bug that would result in nul bytes getting into the log (Issue #1450)
• Fixed possible use-after-free in cupsdReadClient() (Issue #1454)
• Fixed a document format bug in the IPP backend (Issue #1457)
• Fixed DRAIN_OUTPUT race condition (Issue #1461)
• Fixed a bug when then ippFindXxx and ippSetXxx functions were mixed.
• Fixed the mapping of supply type keywords to SNMP names.
• Fixed a bug in the IPP backend when SNMP was disabled.
• Fixed a crash bug in the rastertoepson filter.
• Fixed a bug in cgiCheckVariables.
• Fixed handling read/write errors with OpenSSL (Issue #1506)
• Fixed handling rehandshake error in _httpTLSRead (Issue #1508)
• Fixed a debug printf bug on Windows (Issue #1529)
• Fixed a recursion issue with encoding of nested collections (Issue #1539)
• Fixed parsing of the LimitRequestBody, MaxLogSize, and MaxRequestSize directives in "cupsd.conf" (Issue #1540)
• Fixed a parsing bug in ipptool (Issue #1542)
• Fixed blank line detection in the rastertolabel filter (Issue #1545)
• Fixed httpPeek edge case on compressed streams

This update for cups fixes the following issues

• CVE-2026-27447: Authorization bypass via case-insensitive group-member lookup (bsc#1261572).
• CVE-2026-34978: Path traversal in RSS notify-recipient-uri enables file write outside CacheDir/rss (bsc#1261571).
• CVE-2026-34979: Heap overflow in get_options() (bsc#1261570).
• CVE-2026-34980: Shared PostScript queue lets anonymous Print-Job requests reach lp code execution over the network (bsc#1261569).
• CVE-2026-34990: Local print admin token disclosure using temporary printers (bsc#1261568).
• CVE-2026-39314: negative job-password-supported attribute can lead to a denial of service (bsc#1261743).
• CVE-2026-39316: dangling subscription pointer can lead to a denial of service (bsc#1261742).
• CVE-2026-41079: crafted SNMP response can lead to stack-based out-of-bounds read and sensitive memory disclosure (bsc#1263116).

Changes for cups:

• Version upgrade to 2.4.19

This update for cups fixes the following issues

• CVE-2026-27447: Authorization bypass via case-insensitive group-member lookup (bsc#1261572).
• CVE-2026-34978: Path traversal in RSS notify-recipient-uri enables file write outside CacheDir/rss (bsc#1261571).
• CVE-2026-34979: Heap overflow in get_options() (bsc#1261570).
• CVE-2026-34980: Shared PostScript queue lets anonymous Print-Job requests reach lp code execution over the network (bsc#1261569).
• CVE-2026-34990: Local print admin token disclosure using temporary printers (bsc#1261568).
• CVE-2026-39314: negative job-password-supported attribute can lead to a denial of service (bsc#1261743).
• CVE-2026-39316: dangling subscription pointer can lead to a denial of service (bsc#1261742).
• CVE-2026-41079: crafted SNMP response can lead to stack-based out-of-bounds read and sensitive memory disclosure (bsc#1263116).

Changes for cups:

• Version upgrade to 2.4.19.

• Version upgrade to 2.4.18.

• Version upgrade to 2.4.17:

• The scheduler followed symbolic links when cleaning out its temporary directory (Issue #1448)
• Updated cupsFileGetConf and cupsFilePutConf to escape more characters.
• Updated man page cancel (Issue #984)
• Updated cupsRasterReadHeader to validate more of the page header values (Issue #1501)
• Fixed an issue with the class/printer CGI name checking.
• Fixed infinite loop in http_write() on busy print servers (Issue #827)
• Fixed potential TLS blocking issues (Issue #1128)
• Fixed a job history bug in the scheduler (Issue #1440)
• Fixed notifier logging bug that would result in nul bytes getting into the log (Issue #1450)
• Fixed possible use-after-free in cupsdReadClient() (Issue #1454)
• Fixed a document format bug in the IPP backend (Issue #1457)
• Fixed DRAIN_OUTPUT race condition (Issue #1461)
• Fixed a bug when then ippFindXxx and ippSetXxx functions were mixed.
• Fixed the mapping of supply type keywords to SNMP names.
• Fixed a bug in the IPP backend when SNMP was disabled.
• Fixed a crash bug in the rastertoepson filter.
• Fixed a bug in cgiCheckVariables.
• Fixed handling read/write errors with OpenSSL (Issue #1506)
• Fixed handling rehandshake error in _httpTLSRead (Issue #1508)
• Fixed a debug printf bug on Windows (Issue #1529)
• Fixed a recursion issue with encoding of nested collections (Issue #1539)
• Fixed parsing of the LimitRequestBody, MaxLogSize, and MaxRequestSize directives in "cupsd.conf" (Issue #1540)
• Fixed a parsing bug in ipptool (Issue #1542)
• Fixed blank line detection in the rastertolabel filter (Issue #1545)
• Fixed httpPeek edge case on compressed streams

This update for cups fixes the following issues

• CVE-2026-27447: Authorization bypass via case-insensitive group-member lookup (bsc#1261572).
• CVE-2026-34978: Path traversal in RSS notify-recipient-uri enables file write outside CacheDir/rss (bsc#1261571).
• CVE-2026-34979: Heap overflow in get_options() (bsc#1261570).
• CVE-2026-34980: Shared PostScript queue lets anonymous Print-Job requests reach lp code execution over the network (bsc#1261569).
• CVE-2026-34990: Local print admin token disclosure using temporary printers (bsc#1261568).
• CVE-2026-39314: negative job-password-supported attribute can lead to a denial of service (bsc#1261743).
• CVE-2026-39316: dangling subscription pointer can lead to a denial of service (bsc#1261742).
• CVE-2026-41079: crafted SNMP response can lead to stack-based out-of-bounds read and sensitive memory disclosure (bsc#1263116).

Changes for cups:

• Version upgrade to 2.4.19.

• Version upgrade to 2.4.18.

• Version upgrade to 2.4.17:

• The scheduler followed symbolic links when cleaning out its temporary directory (Issue #1448)
• Updated cupsFileGetConf and cupsFilePutConf to escape more characters.
• Updated man page cancel (Issue #984)
• Updated cupsRasterReadHeader to validate more of the page header values (Issue #1501)
• Fixed an issue with the class/printer CGI name checking.
• Fixed infinite loop in http_write() on busy print servers (Issue #827)
• Fixed potential TLS blocking issues (Issue #1128)
• Fixed a job history bug in the scheduler (Issue #1440)
• Fixed notifier logging bug that would result in nul bytes getting into the log (Issue #1450)
• Fixed possible use-after-free in cupsdReadClient() (Issue #1454)
• Fixed a document format bug in the IPP backend (Issue #1457)
• Fixed DRAIN_OUTPUT race condition (Issue #1461)
• Fixed a bug when then ippFindXxx and ippSetXxx functions were mixed.
• Fixed the mapping of supply type keywords to SNMP names.
• Fixed a bug in the IPP backend when SNMP was disabled.
• Fixed a crash bug in the rastertoepson filter.
• Fixed a bug in cgiCheckVariables.
• Fixed handling read/write errors with OpenSSL (Issue #1506)
• Fixed handling rehandshake error in _httpTLSRead (Issue #1508)
• Fixed a debug printf bug on Windows (Issue #1529)
• Fixed a recursion issue with encoding of nested collections (Issue #1539)
• Fixed parsing of the LimitRequestBody, MaxLogSize, and MaxRequestSize directives in "cupsd.conf" (Issue #1540)
• Fixed a parsing bug in ipptool (Issue #1542)
• Fixed blank line detection in the rastertolabel filter (Issue #1545)
• Fixed httpPeek edge case on compressed streams

This update for cups fixes the following issues

• CVE-2026-27447: Authorization bypass via case-insensitive group-member lookup (bsc#1261572).
• CVE-2026-34978: Path traversal in RSS notify-recipient-uri enables file write outside CacheDir/rss (bsc#1261571).
• CVE-2026-34979: Heap overflow in get_options() (bsc#1261570).
• CVE-2026-34980: Shared PostScript queue lets anonymous Print-Job requests reach lp code execution over the network (bsc#1261569).
• CVE-2026-34990: Local print admin token disclosure using temporary printers (bsc#1261568).
• CVE-2026-39314: negative job-password-supported attribute can lead to a denial of service (bsc#1261743).
• CVE-2026-39316: dangling subscription pointer can lead to a denial of service (bsc#1261742).
• CVE-2026-41079: crafted SNMP response can lead to stack-based out-of-bounds read and sensitive memory disclosure (bsc#1263116).

Changes for cups:

• Version upgrade to 2.4.19

This update for cups fixes the following issues

• CVE-2026-27447: Authorization bypass via case-insensitive group-member lookup (bsc#1261572).
• CVE-2026-34978: Path traversal in RSS notify-recipient-uri enables file write outside CacheDir/rss (bsc#1261571).
• CVE-2026-34979: Heap overflow in get_options() (bsc#1261570).
• CVE-2026-34980: Shared PostScript queue lets anonymous Print-Job requests reach lp code execution over the network (bsc#1261569).
• CVE-2026-39316: dangling subscription pointer can lead to a denial of service (bsc#1261742).

This update for cups fixes the following issues

• CVE-2026-27447: Authorization bypass via case-insensitive group-member lookup (bsc#1261572).
• CVE-2026-34978: Path traversal in RSS notify-recipient-uri enables file write outside CacheDir/rss (bsc#1261571).
• CVE-2026-34979: Heap overflow in get_options() (bsc#1261570).
• CVE-2026-34980: Shared PostScript queue lets anonymous Print-Job requests reach lp code execution over the network (bsc#1261569).
• CVE-2026-39314: negative job-password-supported attribute can lead to a denial of service (bsc#1261743).
• CVE-2026-39316: dangling subscription pointer can lead to a denial of service (1261742).

Ariel Silver discovered that CUPS incorrectly handled username comparisons during authorization checks. A local attacker could possibly use this issue to gain unauthorized access to restricted operations. (CVE-2026-27447)

Asim Viladi Oglu Manizada discovered that CUPS incorrectly handled notify-recipient-uri values in the RSS notifier. A remote attacker could possibly use this issue to overwrite lp-writable files and cause a denial of service. (CVE-2026-34978)

Jacob Newman discovered that CUPS incorrectly handled filter option strings when processing job attributes. An attacker could use this issue to cause CUPS to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-34979)

Asim Viladi Oglu Manizada discovered that CUPS incorrectly handled page-border values in shared PostScript queues. A remote attacker could possibly use this issue to execute arbitrary code. (CVE-2026-34980)

Asim Viladi Oglu Manizada discovered that CUPS incorrectly handled localhost authentication to attacker-controlled IPP services. A local attacker could possibly use this issue to overwrite arbitrary files and execute arbitrary code. (CVE-2026-34990)

Tomer Fichman discovered that CUPS incorrectly handled negative job-password-supported values. A local attacker could possibly use this issue to cause CUPS to crash, resulting in a denial of service. (CVE-2026-39314)

Tomer Fichman discovered that CUPS incorrectly handled temporary printer deletion. An attacker could possibly use this issue to cause CUPS to crash, resulting in a denial of service, or to execute arbitrary code. (CVE-2026-39316)

Tomer Fichman discovered that CUPS incorrectly handled certain malformed SNMP responses. An attacker could possibly use this issue to obtain sensitive information. (CVE-2026-41079)