PT-2026-30236 · Openprinting · Cups

Published 2026-04-03 · Updated 2026-04-03 · CVE-2026-34978

NVD

CVSS v3.1

6.5

Medium

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

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, the RSS notifier allows .. path traversal in notify-recipient-uri (e.g., rss:///../job.cache), letting a remote IPP client write RSS XML bytes outside CacheDir/rss (anywhere that is lp-writable). In particular, because CacheDir is group-writable by default (typically root:lp and mode 0770), the notifier (running as lp) can replace root-managed state files via temp-file + rename(). This PoC clobbers CacheDir/job.cache with RSS XML, and after restarting cupsd the scheduler fails to parse the job cache and previously queued jobs disappear. At time of publication, there are no publicly available patches.

Fix

Path traversal

Weakness Enumeration

CWE-22

Related Identifiers

CVE-2026-34978

Affected Products

Cups

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-34978 · Security Note
• https://github.com/OpenPrinting/cups/security/advisories/GHSA-f53q-7mxp-9gcr · Note