CVE-2026-85597

Summary

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 Software

VendorProductVersion RangeStatus
traefiktraefik0 < 2.11.55affected
traefiktraefik2.11.55unaffected
traefiktraefik3.0.0 <= 3.7.10affected

Weaknesses

  • CWE-863: Incorrect Authorization

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References