CVE-2026-34979

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

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Severity

Moderate

Red Hat Product Security

5.3

CVSS 3.1

Review impact separately from score.

Published · April 4, 2026

Updated · September 1, 2026

Description

A flaw was found in OpenPrinting CUPS. A remote attacker could exploit a heap-based buffer overflow by sending specially crafted job attributes when building filter option strings. This could lead to a denial of service, making the printing system unavailable.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

CVSS / CWE

CVSS 3.1 · 5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')