Disclosure 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.
Source-reported weakness categories
CWE-863
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2026-85597
Open original source · Updated Oct 08, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| traefik | traefik | * {"versionStartIncluding":"3.0.0","versionEndExcluding":"3.7.11"} |
Original records & references
- NIST NVD record
- CVE Program record
- github.com — Exploit, Mitigation, Patch, Vendor Advisory
- www.vulncheck.com — Third Party Advisory
PUBLISHED 2026-09-04T08:17:23-04:00
MODIFIED 2026-10-08T12:17:55-04:00
INGESTED 2026-10-10T20:50:36-04:00