The OpenPrinting CUPS project contains two instances of case-insensitive username comparisons in authorization-adjacent code paths that were not addressed by the original CVE-2026-27447 fix. These exist in the printer ACL validation logic and private-attribute filtering mechanisms:

1. scheduler/ipp.c:check_quotas() - uses _cups_strcasecmp() for printer ACL username matching
2. scheduler/policy.c:cupsdGetPrivateAttrs() - uses _cups_strcasecmp() for @OWNER and explicit username checks

These patterns were removed from the primary authorization path in the original CVE-2026-27447 fix but persist in these secondary paths.

Affected versions: < 2.4.20. No patched release listed at time of advisory (fixes committed but not yet released).

Reference: https://github.com/OpenPrinting/cups/security/advisories/GHSA-r8jp-q6fh-g5r2