Medium [CVE-2026-16254] Denial of service via out-of-bounds slice in claircore's apk installed-database parser
This medium-severity Red Hat Linux advisory covers CVE-2026-16254 affecting Red Hat Advanced Cluster Security 4, Red Hat Quay 3.
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Summary
A flaw was found in claircore's apk package scanner. Malformed package-database data in a container layer can cause an out-of-bounds access that panics the scanner.
If that panic is not recovered, the Clair indexer process can crash, leading to a denial of service. Red Hat Quay deployments, Clair typically runs as multiple OpenShift pods (default >=2, auto-restart).
An unrecovered indexer panic terminates one Clair pod; remaining replicas and kubelet restart limit impact to a temporary interruption of vulnerability indexing, not a lasting Quay registry outage. Therefore Availability is Low (A:L).
Red Hat severity: Moderate — CVSS 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L). Weakness: CWE-125.
Affected Red Hat products: Red Hat Advanced Cluster Security 4; Red Hat Quay 3. Red Hat does not currently list a fixing RHSA for this CVE.
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 6 days 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 6 days ago·verify at source
Mitigation checklist
- Limit image push/indexing to trusted sources until a fix is available. Where possible, run indexing so a single scanner failure cannot disrupt shared indexing capacity.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
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