v2.11.57

anomalyco/opentuiv2.11.57Sep 4, 2026by github-actions[bot]

AI Summary

This release focuses on resolving security advisories and refining the handling of HTTP/3 and ACME DNS challenges. It also includes security hardening measures to prevent specific types of request processing errors.

Key Highlights

Resolves security vulnerabilities identified in multiple advisories
Disables recursive nameserver propagation by default for DNS challenges
Improves HTTP/3 client connection management
Blocks requests with opaque targets
Prevents forwarding of h2c upgrade headers to the backend

Full Release Notes

**Important:** Please read the [migration guide](https://doc.traefik.io/traefik/v2.11/migration/v2/#v21157).

**CVE fixed:**
- Advisory [GHSA-qqjf-53cj-pwvv](https://github.com/traefik/traefik/security/advisories/GHSA-qqjf-53cj-pwvv)
- Advisory [GHSA-f52w-8j3h-j724](https://github.com/traefik/traefik/security/advisories/GHSA-f52w-8j3h-j724)
- Advisory [GHSA-w4v4-9rw7-5326](https://github.com/traefik/traefik/security/advisories/GHSA-w4v4-9rw7-5326)

**Bug fixes:**
- **[acme]** Disable recursive nss propagation by default for DNS challenge ([#13830](https://github.com/traefik/traefik/pull/13830) @rtribotte)
- **[http3]** Dedicate a transport per HTTP/3 client connection ([#13812](https://github.com/traefik/traefik/pull/13812) @sdelicata)
- **[server]** Deny request with an opaque request target ([#13796](https://github.com/traefik/traefik/pull/13796) @sdelicata)
- **[server]** Do not forward h2c upgrade headers to the backend ([#13797](https://github.com/traefik/traefik/pull/13797) @sdelicata)