PatchTheCVECVE-2026-34979: OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems
CVE-2026-34979 is a medium-severity flaw (CVSS 5.3) affecting cups. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, there is a heap-based buffer overflow in the CUPS scheduler when building filter option strings from job attribute. At time of publication, there are no publicly available patches.
Why this priority
- Public exploit reference
- Remotely exploitable, no login, no user action
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.3 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.4% (top 67%) |
| CISA exploited list | No |
| Weakness | CWE-122 |
| Published | 2026-04-03 |
| Last modified | 2026-07-24 |
Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-34979?
cups: upgrade to newer than 2.4.16. Exact commands for each OS are on this page.
Is CVE-2026-34979 being exploited?
CVE-2026-34979 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-34979 affect?
CVE-2026-34979 affects cups. Severity is medium (CVSS 5.3). OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, there is a heap-based buffer overflow in the CUPS scheduler when building filter option strings from job attr
How urgent is CVE-2026-34979?
Priority 42/100. Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist
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