Critical [CVE-2026-48491] Unauthorized access due to mutual TLS bypass
This critical-severity Red Hat Linux advisory covers CVE-2026-48491.
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Summary
Unauthorized access due to mutual TLS bypass. Red Hat rates this important (CVSS 9.1).
Weakness: CWE-807.
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 2 months 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 2 months ago·verify at source
Mitigation checklist
- To mitigate this issue, avoid configuring Traefik with wildcard host rules (e.g., Host(*.example.com)) alongside strict TLS options such as RequireAndVerifyClientCert on entrypoints that also serve permissive SNI configurations. Alternatively, restrict network access to Traefik's entrypoints to trusted networks only, thereby limiting potential exposure.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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