Heap-based buffer overflow in cups - CVE-2026-34979

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Main Vulnerability Database Vulnerabilities #VU124812

Heap-based buffer overflow in cups - CVE-2026-34979

Published: April 2, 2026


Vulnerability identifier: #VU124812
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-34979
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper input validation in the CUPS scheduler when processing IPP job attributes. A remote attacker can send a specially crafted IPP request with large URI attributes to trigger a heap-based buffer overflow in the `get_options()` function, leading to memory corruption and a crash of the `cupsd` service.

The vulnerability specifically arises because the size calculation for the options string uses `ipp_length()`, which excludes URI attributes, but the serialization process still writes URI attributes such as `job-uuid` and `job-authorization-uri` without bounds checking.


Affected software

cups
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Micro
SUSE Linux Micro
Basesystem Module
Development Tools Module
Desktop Applications Module
openEuler
Ubuntu
Anolis OS
Fedora
macOS
cups-libs-debuginfo-32bit
cups-debugsource
cups-client
cups-libs-32bit
cups-libs
cups-devel
cups-client-debuginfo
cups
cups-libs-debuginfo
cups-debuginfo
libcupsppdc1
libcups2-32bit-debuginfo
libcupsimage2
libcupscgi1
cups-config
libcups2-debuginfo
cups-ddk
cups-ddk-debuginfo
libcups2-32bit
libcupscgi1-debuginfo
libcupsimage2-debuginfo
libcupsppdc1-debuginfo
libcupsmime1-debuginfo
libcups2
libcupsmime1
cups-lpd
cups-printerapp
cups-filesystem
cups-help
cups-ipptool
cups-doc
cups (Ubuntu package)

How to mitigate CVE-2026-34979

Install security update from vendor's website.

cups-libs-debuginfo-32bit - update to 1.7.5-20.67.1
cups-debugsource - addressed in versions 1.7.5-20.67.1, 2.2.7-150000.3.93.1, 2.4.19-1.1
cups-client - addressed in versions 1.7.5-20.67.1, 2.2.7-150000.3.93.1
cups-libs-32bit - update to 1.7.5-20.67.1
cups-libs - update to 1.7.5-20.67.1
cups-devel - addressed in versions 1.7.5-20.67.1, 2.2.7-150000.3.93.1
cups-client-debuginfo - addressed in versions 1.7.5-20.67.1, 2.2.7-150000.3.93.1
cups - addressed in versions 1.7.5-20.67.1, 2.2.7-150000.3.93.1
cups-libs-debuginfo - update to 1.7.5-20.67.1
cups-debuginfo - addressed in versions 1.7.5-20.67.1, 2.2.7-150000.3.93.1
libcupsppdc1 - update to 2.2.7-150000.3.93.1
libcups2-32bit-debuginfo - update to 2.2.7-150000.3.93.1
libcupsimage2 - update to 2.2.7-150000.3.93.1
libcupscgi1 - update to 2.2.7-150000.3.93.1
cups-config - addressed in versions 2.2.7-150000.3.93.1, 2.4.19-1.1
libcups2-debuginfo - addressed in versions 2.2.7-150000.3.93.1, 2.4.19-1.1
cups-ddk - update to 2.2.7-150000.3.93.1
cups-ddk-debuginfo - update to 2.2.7-150000.3.93.1
libcups2-32bit - update to 2.2.7-150000.3.93.1
libcupscgi1-debuginfo - update to 2.2.7-150000.3.93.1
libcupsimage2-debuginfo - update to 2.2.7-150000.3.93.1
libcupsppdc1-debuginfo - update to 2.2.7-150000.3.93.1
libcupsmime1-debuginfo - update to 2.2.7-150000.3.93.1
libcups2 - addressed in versions 2.2.7-150000.3.93.1, 2.4.19-1.1
libcupsmime1 - update to 2.2.7-150000.3.93.1
cups-libs - addressed in versions 2.4.0-19, 2.4.7-13, 2.4.7-14
cups-lpd - addressed in versions 2.4.0-19, 2.4.7-13, 2.4.7-14
cups-printerapp - addressed in versions 2.4.0-19, 2.4.7-13, 2.4.7-14
cups-filesystem - addressed in versions 2.4.0-19, 2.4.7-13, 2.4.7-14
cups-help - addressed in versions 2.4.0-19, 2.4.7-13, 2.4.7-14
cups - addressed in versions 2.4.0-19, 2.4.7-13, 2.4.7-14
cups-client - addressed in versions 2.4.0-19, 2.4.7-13, 2.4.7-14
cups-debuginfo - addressed in versions 2.4.0-19, 2.4.7-13, 2.4.7-14
cups-debugsource - addressed in versions 2.4.0-19, 2.4.7-13, 2.4.7-14
cups-devel - addressed in versions 2.4.0-19, 2.4.7-13, 2.4.7-14
cups-ipptool - addressed in versions 2.4.0-19, 2.4.7-13, 2.4.7-14
cups-filesystem - update to 2.4.10-8
cups - update to 2.4.10-8
cups-client - update to 2.4.10-8
cups-devel - update to 2.4.10-8
cups-ipptool - update to 2.4.10-8
cups-libs - update to 2.4.10-8
cups-lpd - update to 2.4.10-8
cups-printerapp - update to 2.4.10-8
cups-doc - update to 2.4.10-8
cups - addressed in versions 2.4.17-1.fc42, 2.4.17-1.fc43, 2.4.17-1.fc44, 2.4.17-1.fc45
macOS - update to 27.0 26A428
cups (Ubuntu package) - addressed in versions 2.4.1op1-1ubuntu4.20, 2.4.1op1-1ubuntu4.21, 2.4.7-1.2ubuntu7.13, 2.4.7-1.2ubuntu7.14, 2.4.12-0ubuntu3.9, 2.4.12-0ubuntu3.10, 2.4.16-1ubuntu1.2, 2.4.16-1ubuntu1.3

External References

Related Security Bulletins