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.

The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2026:0276 advisory.

    Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:

    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, 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-2026-34980:
    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-2026-34979:
    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-2026-34978:
    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.

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

An update of the cups package has been released.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1635 advisory.

    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 attacker can repeat the crash for sustained denial of service. (CVE-2026-39314)

    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. (CVE-2026-39316)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of cups installed on the remote host is prior to 1.6.3-51. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3279 advisory.

    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)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-bce5853e95 advisory.

    2.4.17 - security fixes for CVE-2026-39316, CVE-2026-39314, CVE-2026-34979, CVE-2026-34990,     CVE-2026-27447, CVE-2026-34978


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-34454fdb74 advisory.

    2.4.17 - security fixes for CVE-2026-39316, CVE-2026-39314, CVE-2026-34979, CVE-2026-34990,     CVE-2026-27447, CVE-2026-34978


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-82a2214b53 advisory.

    2.4.17 - security fixes for CVE-2026-39316, CVE-2026-39314, CVE-2026-34979, CVE-2026-34990,     CVE-2026-27447, CVE-2026-34978


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of cups installed on the remote host is prior to 2.4.17. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2026-107-01 advisory.

    New cups packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the cups security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 45 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-7d1173fd68 advisory.

    Automatic update for cups-2.4.17-1.fc45.

    ##### **Changelog**

    ```
    * Fri Apr 17 2026 Zdenek Dohnal <zdohnal@redhat.com> - 1:2.4.17-1
    - 2.4.17 (fedora#2456363, fedora#2456362, fedora#2454994, fedora#2454993,       fedora#2454992, fedora#2454990)

    ```

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
314506	TencentOS Server 4: cups (TSSA-2026:0276)	Nessus	Tencent Local Security Checks	medium
312114	Photon OS 4.0: Cups PHSA-2026-4.0-1008	Nessus	PhotonOS Local Security Checks	medium
311396	Photon OS 5.0: Cups PHSA-2026-5.0-0837	Nessus	PhotonOS Local Security Checks	medium
311327	Amazon Linux 2023 : cups, cups-client, cups-devel (ALAS2023-2026-1635)	Nessus	Amazon Linux Local Security Checks	medium
311214	Amazon Linux 2 : cups, --advisory ALAS2-2026-3279 (ALAS-2026-3279)	Nessus	Amazon Linux Local Security Checks	medium
310205	Fedora 44 : cups (2026-bce5853e95)	Nessus	Fedora Local Security Checks	medium
309195	Fedora 42 : cups (2026-34454fdb74)	Nessus	Fedora Local Security Checks	medium
307661	Fedora 43 : cups (2026-82a2214b53)	Nessus	Fedora Local Security Checks	medium
307392	Slackware Linux 15.0 / current cups Multiple Vulnerabilities (SSA:2026-107-01)	Nessus	Slackware Local Security Checks	medium
307391	Fedora 45 : cups (2026-7d1173fd68)	Nessus	Fedora Local Security Checks	medium
304967	Linux Distros Unpatched Vulnerability : CVE-2026-34979	Nessus	Misc.	medium

Detections

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CVE-2026-34979

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