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Vulnerabilities / CVE-2026-85597

critical

CVE-2026-85597

github.com/traefik/traefik: Traefik: Authentication bypass via TLS option conflict

Published Modified CWE 863
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Red Hat7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by Red Hat (high).

Description

Traefik before v2.11.55 and v3.0.0 through v3.7.10 contain a TLS option conflict resolution vulnerability that allows unauthenticated attackers to bypass client-certificate authentication by creating conflicting TLS options on multi-host routers. Attackers can reach protected backends by exploiting shared TLS resolution across multiple hostnames in a single router rule, causing the strict mTLS requirement to fall back to default options for all hosts.

Affected packages and fixed versions

SourcePackageFixed in
minimostraefik-3, traefik-fips-33.7.11-r0
rapidfort alpine 3.20traefik3.7.11-r0
rapidfort alpine 3.21traefik3.7.11-r0
rapidfort alpine 3.22traefik3.7.11-r0
rapidfort alpine 3.23traefik3.7.11-r0
rapidfort alpine 3.24traefik3.7.11-r0
Show all 7 entries from 6 sources
SourcePackageFixed in
minimostraefik-33.7.11-r0
minimostraefik-fips-33.7.11-r0
rapidfort alpine 3.20traefik3.7.11-r0
rapidfort alpine 3.21traefik3.7.11-r0
rapidfort alpine 3.22traefik3.7.11-r0
rapidfort alpine 3.23traefik3.7.11-r0
rapidfort alpine 3.24traefik3.7.11-r0

References

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.