CUPS has an integer underflow in `_ppdCreateFromIPP` causes root cupsd crash via negative `job-password-supported`
Summary
CUPS has an integer underflow in _ppdCreateFromIPP causes root cupsd crash via negative job-password-supported
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Alpine Linux ALPINE-CVE-2026-39314 cups Fixed in: 2.4.18-r0
- Debian DEBIAN-CVE-2026-39314 cups
- Ubuntu UBUNTU-CVE-2026-39314 cups
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov