What is CVE-2026-34979?

CVE-2026-34979 is a medium-severity vulnerability in Openprinting Cups, classified under Heap-based Buffer Overflow. CVSS score: 5.3/10. Published 2026-04-03.

How severe is CVE-2026-34979?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Buffer overflow in Openprinting Cups

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.

Vulnerability class: Buffer Overflow

Published 2026-04-03 · last modified 2026-07-24.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.004 (34.1th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Openprinting Cups — versions <= 2.4.16

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

github.com/OpenPrinting/cups/security/advisories/GHSA-6qxf-7jx6-86fh (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-34979?: CVE-2026-34979 is a medium-severity vulnerability in Openprinting Cups, classified under Heap-based Buffer Overflow. CVSS score: 5.3/10. Published 2026-04-03.
How severe is CVE-2026-34979?: Medium severity. CVSS v3 base score is 5.3 out of 10.