What is CVE-2026-34990?

CVE-2026-34990 is a high-severity vulnerability in Openprinting Cups, classified under Improper Authentication. CVSS score: 7.8/10. Published 2026-04-03.

How severe is CVE-2026-34990?

High severity. CVSS v3 base score is 7.8 out of 10.

Auth bypass in Openprinting Cups

CVE-2026-34990

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, a local unprivileged user can coerce cupsd into authenticating to an attacker-controlled localhost IPP servi…

Vulnerability class: Broken Authentication

EPSS: 0.003 (21.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Openprinting Cups — versions <= 2.4.16

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-34990?: CVE-2026-34990 is a high-severity vulnerability in Openprinting Cups, classified under Improper Authentication. CVSS score: 7.8/10. Published 2026-04-03.
How severe is CVE-2026-34990?: High severity. CVSS v3 base score is 7.8 out of 10.