---
id: CVE-2026-25949
title: Traefik is an HTTP reverse proxy and load balancer
summary: >-
  Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.8, there is a
  potential vulnerability in Traefik managing STARTTLS requests. An
  unauthenticated client can bypass Traefik entrypoint
  respondingTimeouts.readTimeout by sendi…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-400
  - CWE-770
vendor: traefik
product: traefik
affected:
  - traefik < 3.6.8
patched:
  - traefik 3.6.8
published: '2026-02-12'
updated: '2026-06-30'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-25949'
references:
  - url: >-
      https://github.com/traefik/traefik/commit/31e566e9f1d7888ccb6fbc18bfed427203c35678
    label: security-advisories@github.com
  - url: 'https://github.com/traefik/traefik/releases/tag/v3.6.8'
    label: security-advisories@github.com
  - url: 'https://github.com/traefik/traefik/security/advisories/GHSA-89p3-4642-cr2w'
    label: security-advisories@github.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:6192'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/security/cve/CVE-2026-25949'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2439522'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25949.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
epss: 0.00817
epssPercentile: 0.55252
ingestedAt: '2026-07-03T18:53:52.420Z'
---

## Overview

Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.8, there is a potential vulnerability in Traefik managing STARTTLS requests. An unauthenticated client can bypass Traefik entrypoint respondingTimeouts.readTimeout by sending the 8-byte Postgres SSLRequest (STARTTLS) prelude and then stalling, causing connections to remain open indefinitely, leading to a denial of service. This vulnerability is fixed in 3.6.8.

## Affected

- `traefik < 3.6.8`

## Remediation

Upgrade past the affected range:

- `traefik 3.6.8`