CVE-2026-34980: openprinting cups Improper Input Validation

Vulnerability summary

CVE-2026-34980 is a high (CVSS 7.5) Improper Input Validation vulnerability in openprinting cups. EPSS estimates a 0.34% chance of exploitation in the next 30 days, higher than 25.3% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 03-04-2026
   PublishedVulnerability first disclosed.
2. 06-04-2026
   Last modifiedVulnerability information updated.

Description

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, in a network-exposed cupsd with a shared target queue, an unauthorized client can send a Print-Job to that shared PostScript queue without authentication. The server accepts a page-border value supplied as textWithoutLanguage, preserves an embedded newline through option escaping and reparse, and then reparses the resulting second-line PPD: text as a trusted scheduler control record. A follow-up raw print job can therefore make the server execute an attacker-chosen existing binary such as /usr/bin/vim as lp. At time of publication, there are no publicly available patches.

• CWE-20Improper Input ValidationThe product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.