CVE-2026-39314 — CUPS has an integer underflow in `_ppdCreateFromIPP` causes root cupsd crash via negative `job-password-supported`

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
OpenPrinting / cups	affected <= 2.4.16

CWE

CWE-191

References

https://github.com/OpenPrinting/cups/security/advisories/GHSA-pp8w-2g52-7vj7

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.