---
id: CVE-2026-88007
title: Traefik is an open source HTTP reverse proxy and load balancer
summary: >-
  Traefik is an open source HTTP reverse proxy and load balancer. From 2.11.0
  until 2.11.57 and 3.7.13, the HTTP/3 entrypoint ConnContext does not call
  service.AddTransportOnContext, so kerberosRoundTripper uses a shared backend
  transport …
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-287
  - CWE-863
vendor: traefik
product: traefik
affected:
  - 'traefik >= 2.8.2, < 2.11.56'
  - 'traefik >= 3.0.0, < 3.7.12'
patched:
  - traefik 3.7.12
published: '2026-09-10'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T19:58:52.257'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88007'
references:
  - url: >-
      https://github.com/traefik/traefik/commit/ff39c47d7459dec9cd8de63c1a4e7aa7315bdc1c
    label: security-advisories@github.com
  - url: 'https://github.com/traefik/traefik/pull/13812'
    label: security-advisories@github.com
  - url: 'https://github.com/traefik/traefik/releases/tag/v2.11.57'
    label: security-advisories@github.com
  - url: 'https://github.com/traefik/traefik/releases/tag/v3.7.13'
    label: security-advisories@github.com
  - url: 'https://github.com/traefik/traefik/security/advisories/GHSA-qqjf-53cj-pwvv'
    label: security-advisories@github.com
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88007'
  - url: 'https://github.com/traefik/traefik'
tags:
  - nvd
  - cve.org
  - osv
  - go
epss: 0.006
epssPercentile: 0.46382
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-10T15:38:41.123784Z'
ingestedAt: '2026-09-11T10:30:26.776Z'
aliases:
  - GHSA-qqjf-53cj-pwvv
  - GO-2026-6466
ecosystem: go
---

## Overview

Traefik is an open source HTTP reverse proxy and load balancer. From 2.11.0 until 2.11.57 and 3.7.13, the HTTP/3 entrypoint ConnContext does not call service.AddTransportOnContext, so kerberosRoundTripper uses a shared backend transport instead of a transport dedicated to each frontend connection. With HTTP/3 enabled, a backend using connection-bound NTLM or Negotiate authentication, and backend keep-alive, an unrelated client can reuse a backend connection authenticated for a victim, read victim-only data, and act as that victim without the victim credentials. This issue is fixed in 2.11.57 and 3.7.13.

## Affected

- `traefik >= 2.8.2, < 2.11.56`
- `traefik >= 3.0.0, < 3.7.12`

## Remediation

Upgrade past the affected range:

- `traefik 3.7.12`

## Package advisory (CVE-2026-88007)

Affected packages:

- `github.com/traefik/traefik/v3 >= 3.0.0, < 3.7.13`
- `github.com/traefik/traefik/v2 >= 2.11.0, < 2.11.57`

Patched in:

- `github.com/traefik/traefik/v3 3.7.13`
- `github.com/traefik/traefik/v2 2.11.57`

Source: https://osv.dev/vulnerability/GHSA-qqjf-53cj-pwvv