🛡️ CVE-2026-39314 — cups

🟡 CVSS 4.0 — Medium ⚠️ Exploit Public CWE-191 NVD

4.0

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, an integer underflow vulnerability in _ppdCreateFromIPP() (cups/ppd-cache.c) allows any unprivileged local user to crash the cupsd root process by supplying a negative job-password-supported IPP attribute. The bounds check only caps the upper bound, so a negative value passes validation, is cast to size_t (wrapping to ~2^64), and is used as the length argument to memset() on a 33-byte stack buffer. This causes an immediate SIGSEGV in the cupsd root process. Combined with systemd's Restart=on-failure, an attacker can repeat the crash for sustained denial of service.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability low.

Weakness class

CVE-2026-39314 is classified as CWE-191: Integer Underflow. A subtraction drops below the minimum for the type and wraps, yielding an unexpectedly large value.

Affected software

CVE-2026-39314 is recorded against 1 package.

cups (fixed in 2.4.16)

Timeline and source

Published on 7 April 2026 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

github.com

CVE-2026-39314 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Alpine BellSoft Debian Ubuntu

Details

Severity MEDIUM

CVSS Score 4.0

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

CWE CWE-191

Public Exploit ⚠️ Yes

Source NVD

Published 2026-04-07

Updated 2026-08-11

Modified 2026-06-17

Fix URL N/A

Affected Packages

Software	From version	Fixed in
cups	—	2.4.16

References

Exploit, Mitigation, Vendor Advisory https://github.com/OpenPrinting/cups/security/advisories/GHSA-pp8w-2g52-7vj7

🔗 NVD 🔗 Mitre

Similar Threats

Exploit Protection

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CVE-2026-39314 carries CVSS 4.0 Medium rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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