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Fencer Vulns
medium 5.3

CVE-2026-34979 json

OpenPrinting CUPS: Heap overflow in `get_options()`

published 2026-04-03 7 mo ago modified 2026-07-24 3 mo ago also EUVD-2026-18885

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 35%
public exploits
0
none known

Summary

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.

Patch / fix

  • cups Debian 14 2.4.17-1

debian advisories DEBIAN-CVE-2026-34979

  • cups Ubuntu 22.04 LTS 2.4.1op1-1ubuntu4.20
  • cups Ubuntu 24.04 LTS 2.4.7-1.2ubuntu7.13
  • cups Ubuntu 25.10 2.4.12-0ubuntu3.9
  • cups Ubuntu 26.04 LTS 2.4.16-1ubuntu1.2

ubuntu advisories UBUNTU-CVE-2026-34979

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • cups hummingbird 1 2.4.17-1.hum1
  • cups-lpd hummingbird 1 2.4.17-1.hum1
  • cups-libs hummingbird 1 2.4.17-1.hum1
  • cups-client hummingbird 1 2.4.17-1.hum1
  • cups-ipptool hummingbird 1 2.4.17-1.hum1
  • cups-filesystem hummingbird 1 2.4.17-1.hum1
  • cups-printerapp hummingbird 1 2.4.17-1.hum1

red hat advisories RHSA-2026:8814

  • cups SLE Module for Development Tools 15 SP7, SLE Module for Desktop Applications 15 SP7, SLE Module for Basesystem 15 SP7 +4 more 2.2.7-150000.3.93.1
  • cups SLES LTSS Extended Security 12 SP5 1.7.5-20.67.1

suse advisories SUSE-SU-2026:2732-1SUSE-SU-2026:2718-1

  • cups openSUSE Tumbleweed 2.4.17-1.1

opensuse advisories openSUSE-SU-2026:10589-1

  • cups Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 2.4.18-r0

alpine advisories ALPINE-CVE-2026-34979

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • cups Azure Linux 3.0 2.4.17-1

azure linux advisories AZL-81813

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-34979 updated cvss 5.3

cups: OpenPrinting CUPS: Denial of Service via heap-based buffer overflow in job attribute processing

  • Red Hat Enterprise Linux 6 cups, cups-lpd, cups-php, cups-libs Red Hat Enterprise Linux 7 cups, cups-lpd, cups-libs, cups-client, cups-ipptool, cups-filesystem
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 cups, cups-lpd, cups-libs, cups-client, cups-ipptool, cups-filesystem Red Hat Enterprise Linux 9 cups, cups-lpd, cups-libs, cups-client, cups-ipptool, cups-filesystem, +1 more Red Hat Enterprise Linux 10 cups Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images cups 2.4.17-1.hum1, cups-lpd 2.4.17-1.hum1, cups-libs 2.4.17-1.hum1, cups-client 2.4.17-1.hum1, cups-ipptool 2.4.17-1.hum1, cups-filesystem 2.4.17-1.hum1, +1 more
    fixed: vendor fix RHSA-2026:8814

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/OpenPrinting/cups/security/advisories/GHSA-6qxf-7jx6-86fh referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

  • OpenPrinting cups

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.