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.
Attack Parameters
Attack Vector
Adjacent
Requires local network access
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 5
https://access.redhat.com/security/cve/CVE-2026-87875
secalert@redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2530994
secalert@redhat.com
https://github.com/OpenPrinting/cups/security/advisories/GHSA-559w-7676-3xrq
secalert@redhat.com
https://github.com/OpenPrinting/cups/commit/0c6842fc615e8afa284136a092da8178abf…
secalert@redhat.com
https://github.com/OpenPrinting/cups/commit/2b1dc178a2d2325135b855142e384f4e8c4…
secalert@redhat.com