CVE-2026-87875

Summary

The cupsUTF32ToUTF8() function in CUPS's cups/transcode.c lacks a source-length bound and can read past the end of the source buffer, resulting in a heap out-of-bounds read. This is reachable via SNMP supply-description parsing in backend/snmp-supplies.c with attacker-controlled content.

Affected Software

Weaknesses

• CWE-125: Out-of-bounds Read

Workarounds

Fixed on upstream master branch with commit 0c6842f and for versions 2.4.x with commit 2b1dc17.

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

Additional References

• https://github.com/OpenPrinting/cups/security/advisories/GHSA-559w-7676-3xrq

References

• https://access.redhat.com/security/cve/CVE-2026-87875
• https://bugzilla.redhat.com/show_bug.cgi?id=2530994
• https://github.com/OpenPrinting/cups/commit/0c6842fc615e8afa284136a092da8178abf5f142
• https://github.com/OpenPrinting/cups/commit/2b1dc178a2d2325135b855142e384f4e8c42d8e4
• https://github.com/OpenPrinting/cups/security/advisories/GHSA-559w-7676-3xrq

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