---
id: CVE-2026-114635
title: Traefik before v2.11.58 and v3.7.14 SNI Check Bypass via HTTP/2 Scheme
summary: >-
  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 ov…
severity: high
cvss: 8.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-288
vendor: traefik
product: traefik
affected:
  - traefik < 2.11.58
  - traefik >= 3.0.0 < 3.7.14
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T01:43:36.508Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-114635'
references:
  - url: 'https://github.com/traefik/traefik/security/advisories/GHSA-fh26-gfpp-7xxx'
    label: GitHub Security Advisory (GHSA-fh26-gfpp-7xxx)
  - url: >-
      https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.14-sni-check-bypass-via-http-2-scheme
    label: >-
      VulnCheck Advisory: Traefik before v2.11.58 and v3.7.14 SNI Check Bypass
      via HTTP/2 Scheme
tags:
  - cve.org
ingestedAt: '2026-10-22T02:23:25.185Z'
---

## Overview

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

- `traefik < 2.11.58`
- `traefik >= 3.0.0 < 3.7.14`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.