traefik

:warning: **Breaking change** :warning: As explained in the comment left on the [CVE-2025-66490 fix](https://github.com/traefik/traefik/pull/12360#issuecomment-3729140469), this new hotfix version makes the behavior opt-in. As a result, this release is breaking compared to the previous hotfix versions since [v3.6.4](https://github.com/traefik/traefik/releases/tag/v3.6.4), but it restores by default the behavior that existed before that hotfix. Please, read the [migration guide](https://doc.traefik.io/traefik/v3.6/migrate/v3/#v367) to enable the feature. CVE fixed: - [CVE-2026-22045](https://nvd.nist.gov/vuln/detail/CVE-2026-22045) (Advisory [GHSA-cwjm-3f7h-9hwqj](https://github.com/traefik/traefik/security/advisories/GHSA-cwjm-3f7h-9hwq)) **Bug fixes:** - **[acme]** Bump github.com/go-acme/lego/v4 to v4.31.0 ([#12529](https://github.com/traefik/traefik/pull/12529) by [ldez](https://github.com/ldez)) - **[acme]** Add missing renew options ([#12467](https://github.com/traefik/traefik/pull/12467) by [ldez](https://github.com/ldez)) - **[acme]** Replace hardcoded references to LetsEncrypt in log messages ([#12464](https://github.com/traefik/traefik/pull/12464) by [schildbach](https://github.com/schildbach)) - **[k8s/ingress-nginx]** Fix use-regex nginx annotation ([#12531](https://github.com/traefik/traefik/pull/12531) by [LBF38](https://github.com/LBF38)) - **[k8s/ingress-nginx]** Prevent Ingress Nginx provider http router to attach to an entrypoint with TLS ([#12528](https://github.com/traefik/traefik/pull/12528) by [rtribotte](https://github.com/rtribotte)) - **[k8s/ingress]** Fix panic for empty defaultBackend and defaultBackend without resources ([#12509](https://github.com/traefik/traefik/pull/12509) by [gndz07](https://github.com/gndz07)) - **[k8s]** Fix condition used for serving and fenced endpoints ([#12521](https://github.com/traefik/traefik/pull/12521) by [LBF38](https://github.com/LBF38)) - **[webui]** Validate X-Forwarded-Prefix value for dashboard redirect ([#12514](https://github.com/traefik/traefik/pull/12514) by [LBF38](https://github.com/LBF38)) - **[acme]** Add timeout to ACME-TLS/1 challenge handshake ([#12516](https://github.com/traefik/traefik/pull/12516) by [LBF38](https://github.com/LBF38)) - **[server]** Make encoded character options opt-in ([#12540](https://github.com/traefik/traefik/pull/12540) by [gndz07](https://github.com/gndz07)) **Documentation:** - **[docker/swarm]** Update swarm.md traefik version ([#12508](https://github.com/traefik/traefik/pull/12508) by [DBouraoui](https://github.com/DBouraoui)) - **[k8s/ingress-nginx]** Fix ingress-nginx annotations documentation ([#12510](https://github.com/traefik/traefik/pull/12510) by [nmengin](https://github.com/nmengin)) - **[k8s]** Fix Kubernetes reference yml file ([#12406](https://github.com/traefik/traefik/pull/12406) by [mmatur](https://github.com/mmatur)) - Fix code copy button positioning ([#12520](https://github.com/traefik/traefik/pull/12520) by [AnuragEkkati](https://github.com/AnuragEkkati)) - Fix typo in kubernetes.md ([#12515](https://github.com/traefik/traefik/pull/12515) by [EdwardSalkeld](https://github.com/EdwardSalkeld)) - Bring back security section on API & Dashboard documentation page ([#12507](https://github.com/traefik/traefik/pull/12507) by [gndz07](https://github.com/gndz07)) - Fix link description in Traefik Proxy documentation ([#12488](https://github.com/traefik/traefik/pull/12488) by [schaerfo](https://github.com/schaerfo)) - Add product comparison matrix and features page ([#12037](https://github.com/traefik/traefik/pull/12037) by [sheddy-traefik](https://github.com/sheddy-traefik)) **Misc:** - Merge branch v2.11 into v3.6 ([#12552](https://github.com/traefik/traefik/pull/12552) by [rtribotte](https://github.com/rtribotte)) - Merge branch v2.11 into v3.6 ([#12533](https://github.com/traefik/traefik/pull/12533) by [mmatur](https://github.com/mmatur)) - Merge branch v2.11 into v3.6 ([#12497](https://github.com/traefik/traefik/pull/12497) by [mmatur](https://github.com/mmatur))

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