CVE-2026-85597
Traefik before v2.11.55 contains 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.
Scoring
- Severity
- HIGH
- CVSS base score
- 8.2
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- EPSS probability
- 0.23%
- CWE
- CWE-863
- Published
- 2026-09-04
- Last modified
- 2026-09-05
Affected products
- traefik traefik
- traefik traefik
- traefik traefik
Weakness type
Related vulnerabilities
- CVE-2026-87544 — Incorrect authorization in Extensions in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to bypass system
- CVE-2026-87492 — Incorrect authorization in DevTools in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to potentially exe
- CVE-2026-87570 — Incorrect authorization in SiteIsolation in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compr
- CVE-2026-79708 — Incorrect Authorization in GitLab
- CVE-2026-87481 — Incorrect authorization in WebView in Google Chrome on on Android prior to 153.0.8010.36 allowed a remote attacker who h
- CVE-2026-87644 — Incorrect authorization in Views in Google Chrome on on Windows prior to 153.0.8010.36 allowed a remote attacker who had
- CVE-2026-87505 — Incorrect authorization in FileSystem in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromi
- CVE-2026-87499 — Incorrect authorization in Network in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised