What’s Vulnerable › Vulnerabilities

CVE-2025-58436: OpenPrinting CUPS slow client can halt cupsd, leading to a possible DoS attack

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-11-29 · updated 2026-10-07
• Weakness: CWE-400

Description

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. Prior to version 2.4.15, a client that connects to cupsd but sends slow messages, e.g. only one byte per second, delays cupsd as a whole, such that it becomes unusable by other clients. This issue has been patched in version 2.4.15.

Affected products

• OpenPrinting cups: before 2.4.15 — fixed in 2.4.15

How to fix

Upgrade to a fixed version: OpenPrinting cups 2.4.15. Check the vendor advisory for mitigations.

References

• https://github.com/OpenPrinting/cups/commit/40008d76a001babbb9beb9d9d74b01a86fb6ddb4
• https://github.com/OpenPrinting/cups/releases/tag/v2.4.15
• https://github.com/OpenPrinting/cups/security/advisories/GHSA-8wpw-vfgm-qrrr
• http://www.openwall.com/lists/oss-security/2025/11/27/4
• https://github.com/OpenPrinting/cups/security/advisories/GHSA-8wpw-vfgm-qrrr

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