# CVE-2026-114637: Traefik v3.2.0 before v3.7.14 FastProxy NTLM/Negotiate Connection Pool Identity Leak


- **Severity:** High 7.0 (`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`)
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 22 Oct 2026
- **Updated:** 28 Oct 2026
- **Also known as:** GHSA-53qr-784g-cj35, GHSA-68x8-f35f-jp2f

## What is CVE-2026-114637?

CVE-2026-114637 is a high-severity vulnerability in Traefik Traefik, published on 22 Oct 2026. 

### Official description

Traefik from v3.2.0 before v3.7.14 contains an authentication bypass vulnerability in the experimental FastProxy connection pool, which fails to pin NTLM/Negotiate-authenticated backend connections to their frontend connection. Unauthenticated clients can be handed a pooled keep-alive backend connection where a victim completed an NTLM or Negotiate handshake, letting them read victim data and act as that victim.

Weakness: CWE-488 (Exposure of Data Element to Wrong Session)

## Which versions are affected by CVE-2026-114637?

It affects 1 product.


Products: Traefik Traefik.

## How do I fix CVE-2026-114637?

Upgrade to a fixed version.

## Is CVE-2026-114637 being exploited?

There is no known exploitation of CVE-2026-114637 in the wild and no public exploit code.

## Other vulnerabilities in Traefik Traefik

- [CVE-2024-45410](https://insights.sbomify.com/CVE-2024-45410/): HTTP client can remove the X-Forwarded headers in Traefik (critical 9.8)
- [CVE-2026-88877](https://insights.sbomify.com/CVE-2026-88877/): Traefik v3.7.0 Authentication Bypass via from-to-www-redirect (critical 9.3)
- [CVE-2026-85595](https://insights.sbomify.com/CVE-2026-85595/): Traefik before v2.11.55 and v3.0.0 through v3.7.10 Authentication Bypass via digestAuth (critical 9.3)
- [CVE-2026-88007](https://insights.sbomify.com/CVE-2026-88007/): Traefik HTTP/3 Backend NTLM Connection Reuse (critical 9.1)
- [CVE-2026-88009](https://insights.sbomify.com/CVE-2026-88009/): Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-114637 and fix it if it is affected.

What it is: CVE-2026-114637 is a high-severity vulnerability in Traefik Traefik, published on 22 Oct 2026. 
Exploitation: There is no known exploitation of CVE-2026-114637 in the wild and no public exploit code.

Affected product: Traefik Traefik. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-114637/ (Markdown: https://insights.sbomify.com/CVE-2026-114637/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-114637
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-114637
- OSV: https://osv.dev/vulnerability/CVE-2026-114637

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-114637/
Summaries are generated and may contain mistakes; the official description above is the record.