v2.11.57

asheshgoplani/agent-deckv2.11.57Sep 4, 2026by github-actions[bot]

Upgrading?

AI Summary

A maintenance release for the v2.11 branch addressing security vulnerabilities and specific bug fixes related to ACME, HTTP/3, and server security.

Key Highlights

  • Fixed 4 security advisories (CVEs).
  • Disabled recursive NSS propagation by default for the DNS challenge.
  • Enhanced HTTP/3 client connections with dedicated transports.
  • Added security measures to deny requests with opaque request targets.
  • Stopped forwarding 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)

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