Is CVE-2026-34978 actively exploited?

No active exploitation of CVE-2026-34978 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-34978 be exploited remotely?

Yes. CVE-2026-34978 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-34978?

CVE-2026-34978 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2026-34978

CWE-22Published: April 3, 2026· Updated: Apr 7, 2026

6.5

CVSS v3.1

EPSS:0.06%probability of exploitation in 30 daysPercentile:18.0th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-34978 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.