What’s Vulnerable › Vulnerabilities

CVE-2026-114635: Traefik before v2.11.58 and v3.7.14 SNI Check Bypass via HTTP/2 Scheme

• Severity: high (CVSS 8.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-22 · updated 2026-10-27
• Weakness: CWE-288

Description

Traefik before v2.11.58 and v3.7.14 contains an authentication bypass vulnerability in its SNI check, which is skipped when request TLS state is nil. Unauthenticated clients can send HTTP/2 requests with the :scheme http pseudo-header over TLS on Go 1.27 builds to reach routers requiring client certificates without presenting one.

Affected products

• Traefik: before 2.11.58; from 3.0.0 before 3.7.14 — fixed in 2.11.58, 3.7.14
• Traefik: before 2.11.58; from 3.0.0 before 3.7.14 — fixed in 2.11.58, 3.7.14

How to fix

Upgrade to a fixed version: Traefik 2.11.58, 3.7.14; Traefik 2.11.58, 3.7.14. Check the vendor advisory for mitigations.

References

• https://github.com/traefik/traefik/security/advisories/GHSA-fh26-gfpp-7xxx
• https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.14-sni-check-bypass-via-http-2-scheme

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