#VU124812 Heap-based buffer overflow in cups - CVE-2026-34979
Published: April 2, 2026
Vulnerability identifier: #VU124812
Vulnerability risk: Medium
CVSSv4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-34979
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
cups
cups
Software vendor:
OpenPrinting
OpenPrinting
Description
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.
Remediation
Install security update from vendor's website.