Low [CVE-2026-27447 +1] Remaining case-insensitive username matching in scheduler side paths (CVE-2026-27447 follow-up)
This low-severity Red Hat Linux advisory covers CVE-2026-27447 and CVE-2026-87876 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
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Summary
Two case-insensitive comparisons on request-derived usernames outside the main authorization path in CUPS's scheduler (printer ACL validation and private-attribute filtering) could allow bypass of username-based access controls in certain configurations. Red Hat severity: Low — CVSS 3 (CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N).
Weakness: CWE-178. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Hardened Images; Red Hat OpenShift Container Platform 4.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: cups.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- Fixed on upstream master branch with commit f56844d and for versions 2.4.x with commit 88e67c0.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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