# CVE-2026-34990

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 file:///... queue even though the normal FileDevice policy rejects such URIs. Printing to that queue gives an arbitrary root file overwrite; the PoC below uses that primitive to drop a sudoers fragment and demonstrate root command execution. At time of publication, there are no publicly available patches.

- Page: https://www.vulneraibility.com/cve/CVE-2026-34990
- CVSS: 7.8
- Known exploited: not in CISA KEV as of our last sync
- EPSS: 0.29% (percentile 22.4)
- Unvetted proof-of-concept code on GitHub: 12 GitHub proofs of concept (first 2026-08-06)
- CISA SSVC: exploitation poc, automatable no, technical impact total (assessed 2026-04-06)
- Weakness: CWE-287
- Published: 2026-04-03

## Affected versions

- OpenPrinting cups: affected <= 2.4.16

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://github.com/OpenPrinting/cups/security/advisories/GHSA-c54j-2vqw-wpwp

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.