CVE-2026-61702 is a directory traversal vulnerability in OpenPrinting CUPS prior to version 2.4.20. It allows an attacker to manipulate the pathname used when processing job-sheet banners, potentially causing the scheduler to read arbitrary files accessible via symlinks and copy their contents into job-sheet spool objects. This could expose file contents to an attacker-observable endpoint. The issue is fixed in version 2.4.20.
CVE-2026-55480 is a vulnerability in OpenPrinting CUPS prior to version 2.4.20 where a race condition in the copy_model() function allows a privileged process to follow a symlink and overwrite arbitrary root-writable files. This occurs because a temporary file path is created in a group-writable directory without secure flags, enabling symlink attacks. Exploitation requires an attacker with lp-group write access and a privileged add-printer or modify-printer operation. The issue is fixed in version 2.4.20.
OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. Prior to 2.4.20, the cupsdCreateJob option-string builder in scheduler/job.c maps attacker-controlled destination-uri and pre-dial-string values from a configured fax queue to the phone and faxPrefix options. Unlike ordinary IPP job attributes, these mapped fax values bypass the control-character sanitizer and are copied directly into the filter options argument. A user permitted to submit a job can therefore inject control characters into the downstream option stream. The reporter states that a downstream fax filter passing these values to a shell or modem command could execute code as lp, while the maintainer states that CUPS has no confidentiality or integrity impact because the only known code-executing filter is optional Foomatic and addressed separately, leaving possible disruption of the affected queue. This issue is fixed in version 2.4.20.
CUPS (Common Unix Printing System) ist ein Printspooler, der es lokalen und entfernten Benutzern ermöglicht, Druckfunktionen über das Internet Printing Protocol (IPP) zu nutzen.
CVE-2026-41079 is a medium severity vulnerability in OpenPrinting CUPS versions prior to 2.4.17. It involves an out-of-bounds read triggered by a crafted SNMP response sent to the CUPS SNMP backend. This flaw allows reading up to 176 bytes beyond a stack buffer, leaking memory that is converted to UTF-8 and exposed as printer supply descriptions. These leaked strings can be viewed by authenticated users through IPP Get-Printer-Attributes responses and the CUPS web interface. The vulnerability does not impact integrity or availability and requires network adjacency but no privileges or user interaction. A fix is available in version 2.4.17.
OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, a use-after-free vulnerability exists in the CUPS scheduler (cupsd) when temporary printers are automatically deleted.cupsdDeleteTemporaryPrinters() in scheduler/printers.c calls cupsdDeletePrinter() without first expiring subscriptions that reference the printer, leaving cupsd_subscription_t.dest as a dangling pointer to freed heap memory. The dangling pointer is subsequently dereferenced at multiple code sites, causing a crash (denial of service) of the cupsd daemon. With heap grooming, this can be leveraged for code execution.
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 attacker can repeat the crash for sustained denial of service.
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.
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.
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-2026-34990 is an improper authentication vulnerability in OpenPrinting CUPS versions 2.4.16 and earlier. A local unprivileged user can trick the CUPS daemon into authenticating to a malicious localhost IPP service using a reusable authorization token. This token allows the attacker to perform administrative requests locally, including creating a printer queue with a file URI that bypasses normal policy restrictions. Exploiting this flaw can lead to arbitrary root file overwrites, enabling privilege escalation to root. No patches or official fixes are available at the time of publication.
CVE-2026-27447 is an authorization bypass vulnerability in OpenPrinting CUPS versions 2.4.16 and earlier. The issue arises from case-insensitive username comparison during authorization checks in the CUPS daemon, allowing an unprivileged user to perform restricted operations by using a username differing only in letter case from an authorized user. No patches or official fixes are available at the time of publication. The vulnerability has a medium severity rating with a CVSS score of 4.8.
OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. Prior to version 2.4.15, a client that connects to cupsd but sends slow messages, e.g.only one byte per second, delays cupsd as a whole, such that it becomes unusable by other clients. This issue has been patched in version 2.4.15.
OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. Prior to version 2.4.15, a user in the lpadmin group can use the cups web ui to change the config and insert a malicious line. Then the cupsd process which runs as root will parse the new config and cause an out-of-bound write. This issue has been patched in version 2.4.15.