PatchTheCVECVE-2026-34990: OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems
CVE-2026-34990 is a high-severity flaw (CVSS 7.8) 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, a local unprivileged user can coerce cupsd into authenticating to an attacker-controlled localhost IPP service with a reusable Authorization: Local ... token. That token is enough to drive /admin/ requests on localhost, and the attacker can combine CUPS-Create-Local-Printer with printer-is-shared=true to persist a fil
Why this priority
- High severity
- Public exploit reference
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.8 (High) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 79%) |
| CISA exploited list | No |
| Weakness | CWE-287 |
| 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-2026-34990?
cups: upgrade to newer than 2.4.16. Exact commands for each OS are on this page.
Is CVE-2026-34990 being exploited?
CVE-2026-34990 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-2026-34990 affect?
CVE-2026-34990 affects cups. Severity is high (CVSS 7.8). OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, a local unprivileged user can coerce cupsd into authenticating to an attacker-controlled localhost IPP servic
How urgent is CVE-2026-34990?
Priority 43/100. High severity; Public exploit reference; On your watchlist
Related CVEs
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- CVE-2026-39314 MEDIUM 4.0 UPGRADE OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems
- CVE-2026-107885 LOW 3.3 UPGRADE OpenPrinting CUPS through 2.4.20 contains a resource-exhaustion vulnerability in the submission-timeout handli
- CVE-2026-107886 LOW 2.3 UPGRADE OpenPrinting CUPS before 2.4.20 contains a double-free in printer-class management