CVE-2026-114635
Traefik before v2.11.58 and v3.7.14 SNI Check Bypass via HTTP/2 Scheme
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| traefik traefik github.com/traefik/traefik/v2
golang |
≥ 0; < 2.11.58 (affected, semver) 2.11.58 (unaffected, semver) Other versions: unaffected |
CNA: VulnCheck |
| traefik traefik github.com/traefik/traefik/v3
golang |
≥ 3.0.0; < 3.7.14 (affected, semver) 3.7.14 (unaffected, semver) Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 7.0 high |
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N | CNA: VulnCheck |
| 3.1 / 8.7 high |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N | CNA: VulnCheck |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/traefik/traefik/security/advisories/GHSA-fh26-gfpp-7xxxCNA: VulnCheck · vendor-advisory
- https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.14-sni-check-bypass-via-http-2-schemeCNA: VulnCheck · third-party-advisory
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