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Configurable max request header size#13353

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traefik:v2.11from
juliens:backport-max-header-bytes-v2.11
Jun 15, 2026
Merged

Configurable max request header size#13353
traefiker merged 1 commit into
traefik:v2.11from
juliens:backport-max-header-bytes-v2.11

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@juliens

@juliens juliens commented Jun 12, 2026

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What does this PR do?

Backports #10995 to the v2.11 branch.

Motivation

This option exists since v3.2 but is not available in v2.11 and it allows to mitigate memory consumption.

More

  • Added/updated tests
  • Added/updated documentation

@juliens juliens added this to the 2.11 milestone Jun 12, 2026

@gndz07 gndz07 left a comment

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LGTM

@traefiker
traefiker force-pushed the backport-max-header-bytes-v2.11 branch from a8f4aa9 to 302f4a0 Compare June 15, 2026 13:14
@traefiker
traefiker merged commit d270272 into traefik:v2.11 Jun 15, 2026
52 checks passed
JuliusFreudenberger pushed a commit to JuliusFreudenberger/nix-config that referenced this pull request Jul 2, 2026
This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [traefik](https://github.com/containous/traefik) | patch | `v3.7.5` → `v3.7.6` |

---

> ⚠️ **Warning**
>
> Some dependencies could not be looked up. Check the [Dependency Dashboard](issues/12) for more information.

---

### Release Notes

<details>
<summary>containous/traefik (traefik)</summary>

### [`v3.7.6`](https://github.com/containous/traefik/blob/HEAD/CHANGELOG.md#v376-2026-06-30)

[Compare Source](traefik/traefik@v3.7.6...v3.7.6)

[All Commits](traefik/traefik@v3.7.5...v3.7.6)

**Bug fixes:**

- **\[acme, logs]** Bump github.com/go-acme/lego/v5 ([#&#8203;13154](traefik/traefik#13154) [@&#8203;ldez](https://github.com/ldez))
- **\[acme]** Bump github.com/go-acme/lego/v5 ([#&#8203;13359](traefik/traefik#13359) [@&#8203;juliens](https://github.com/juliens))
- **\[k8s, k8s/ingress-nginx]** Fix ingress-nginx ssl passthrough status updates ([#&#8203;13212](traefik/traefik#13212) [@&#8203;nickmnt](https://github.com/nickmnt))
- **\[k8s/gatewayapi]** Add missing Gateway API features in conformance tests ([#&#8203;13356](traefik/traefik#13356) [@&#8203;AnatoleLucet](https://github.com/AnatoleLucet))
- **\[k8s/gatewayapi]** Avoid collisions for Gateway API services names ([#&#8203;13367](traefik/traefik#13367) [@&#8203;rtribotte](https://github.com/rtribotte))
- **\[k8s/gatewayapi]** Ignore other gateways parentRefs and update route parent statuses only for managed gateways ([#&#8203;13397](traefik/traefik#13397) [@&#8203;rtribotte](https://github.com/rtribotte))
- **\[k8s/ingress-nginx]** Configure retry according to buffering configuration ([#&#8203;13039](traefik/traefik#13039) [@&#8203;rtribotte](https://github.com/rtribotte))
- **\[k8s/ingress-nginx]** Fix force-ssl-redirect routing 418 when TLS is terminated upstream ([#&#8203;13386](traefik/traefik#13386) [@&#8203;carloslima](https://github.com/carloslima))
- **\[k8s]** Detect EndpointSlice condition changes ([#&#8203;13405](traefik/traefik#13405) [@&#8203;kevinpollet](https://github.com/kevinpollet))
- **\[k8s]** Index Kubernetes EndpointSlice by service name ([#&#8203;13395](traefik/traefik#13395) [@&#8203;kevinpollet](https://github.com/kevinpollet))
- **\[k8s]** Sort endpointslices to keep backend IPs consistent across rebuilds ([#&#8203;13406](traefik/traefik#13406) [@&#8203;kevinpollet](https://github.com/kevinpollet))
- **\[kv]** Bump kvtools/redis to v1.2.1 ([#&#8203;13403](traefik/traefik#13403) [@&#8203;ldez](https://github.com/ldez))
- **\[middleware, authentication]** Fix x-forwarded-port in forward-auth ([#&#8203;13344](traefik/traefik#13344) [@&#8203;juliens](https://github.com/juliens))
- **\[middleware, k8s/gatewayapi]** Fix Gateway API redirect missing statuses ([#&#8203;13360](traefik/traefik#13360) [@&#8203;AnatoleLucet](https://github.com/AnatoleLucet))
- **\[middleware, k8s/gatewayapi]** Fix Host header not being modified by RequestHeaderModifier ([#&#8203;12805](traefik/traefik#12805) [@&#8203;mihuross](https://github.com/mihuross))
- **\[middleware, k8s/gatewayapi]** Fix request scheme derivation when Gateway API RequestRedirect omits scheme ([#&#8203;13347](traefik/traefik#13347) [@&#8203;gndz07](https://github.com/gndz07))
- **\[middleware]** Fix CORS Max-Age set to 0 by default ([#&#8203;13371](traefik/traefik#13371) [@&#8203;AnatoleLucet](https://github.com/AnatoleLucet))
- **\[middleware]** Fix CORS wildcard when allow-credentials is true ([#&#8203;13368](traefik/traefik#13368) [@&#8203;AnatoleLucet](https://github.com/AnatoleLucet))
- **\[server]** Add an option to remove request headers with underscores ([#&#8203;13262](traefik/traefik#13262) [@&#8203;youkoulayley](https://github.com/youkoulayley))
- **\[server]** Configurable max request header size ([#&#8203;13353](traefik/traefik#13353) [@&#8203;juliens](https://github.com/juliens))
- **\[tls]** Fix nondeterministic TLS certificate selection on shared SAN ([#&#8203;13348](traefik/traefik#13348) [@&#8203;rtribotte](https://github.com/rtribotte))
- **\[webui]** Bump axios to v1.18.0 ([#&#8203;13380](traefik/traefik#13380) [@&#8203;gndz07](https://github.com/gndz07))
- **\[websocket]** Fix connection upgrades when backend server is using h2c scheme ([#&#8203;12967](traefik/traefik#12967) [@&#8203;stffabi](https://github.com/stffabi))

**Documentation:**

- **\[k8s/crd]** Fix broken CRD reference links in IngressRoute page ([#&#8203;13375](traefik/traefik#13375) [@&#8203;s3onghyun](https://github.com/s3onghyun))
- **\[k8s/gatewayapi]** Remove experimental note for Gateway API/TLSRoute documentation ([#&#8203;13392](traefik/traefik#13392) [@&#8203;jnoordsij](https://github.com/jnoordsij))
- **\[k8s/ingress-nginx]** Add Kubernetes Ingress NGINX to the providers list ([#&#8203;13372](traefik/traefik#13372) [@&#8203;nmengin](https://github.com/nmengin))
- **\[k8s]** Align Helm chart documented values with chart v41 ([#&#8203;13366](traefik/traefik#13366) [@&#8203;mloiseleur](https://github.com/mloiseleur))
- **\[middleware, authentication, k8s/ingress-nginx]** Clarify intentional auth-response-headers gating and absence of stripping incoming X-Forwarded-\* headers ([#&#8203;13342](traefik/traefik#13342) [@&#8203;rtribotte](https://github.com/rtribotte))
- **\[middleware]** Clarify entryPoint middleware reference format ([#&#8203;13364](traefik/traefik#13364) [@&#8203;mloiseleur](https://github.com/mloiseleur))
- **\[security]** Add HTTP/2 header memory exhaustion security documentation ([#&#8203;13381](traefik/traefik#13381) [@&#8203;emilevauge](https://github.com/emilevauge))
- Adds documentations on maxHeaderBytes ([#&#8203;13363](traefik/traefik#13363) [@&#8203;juliens](https://github.com/juliens))
- Fix inaccuracies in reference documentation ([#&#8203;13304](traefik/traefik#13304) [@&#8203;sheddy-traefik](https://github.com/sheddy-traefik))

### [`v3.7.6`](https://github.com/containous/traefik/blob/HEAD/CHANGELOG.md#v376-2026-06-30)

[Compare Source](traefik/traefik@v3.7.5...v3.7.6)

[All Commits](traefik/traefik@v3.7.5...v3.7.6)

**Bug fixes:**

- **\[acme, logs]** Bump github.com/go-acme/lego/v5 ([#&#8203;13154](traefik/traefik#13154) [@&#8203;ldez](https://github.com/ldez))
- **\[acme]** Bump github.com/go-acme/lego/v5 ([#&#8203;13359](traefik/traefik#13359) [@&#8203;juliens](https://github.com/juliens))
- **\[k8s, k8s/ingress-nginx]** Fix ingress-nginx ssl passthrough status updates ([#&#8203;13212](traefik/traefik#13212) [@&#8203;nickmnt](https://github.com/nickmnt))
- **\[k8s/gatewayapi]** Add missing Gateway API features in conformance tests ([#&#8203;13356](traefik/traefik#13356) [@&#8203;AnatoleLucet](https://github.com/AnatoleLucet))
- **\[k8s/gatewayapi]** Avoid collisions for Gateway API services names ([#&#8203;13367](traefik/traefik#13367) [@&#8203;rtribotte](https://github.com/rtribotte))
- **\[k8s/gatewayapi]** Ignore other gateways parentRefs and update route parent statuses only for managed gateways ([#&#8203;13397](traefik/traefik#13397) [@&#8203;rtribotte](https://github.com/rtribotte))
- **\[k8s/ingress-nginx]** Configure retry according to buffering configuration ([#&#8203;13039](traefik/traefik#13039) [@&#8203;rtribotte](https://github.com/rtribotte))
- **\[k8s/ingress-nginx]** Fix force-ssl-redirect routing 418 when TLS is terminated upstream ([#&#8203;13386](traefik/traefik#13386) [@&#8203;carloslima](https://github.com/carloslima))
- **\[k8s]** Detect EndpointSlice condition changes ([#&#8203;13405](traefik/traefik#13405) [@&#8203;kevinpollet](https://github.com/kevinpollet))
- **\[k8s]** Index Kubernetes EndpointSlice by service name ([#&#8203;13395](traefik/traefik#13395) [@&#8203;kevinpollet](https://github.com/kevinpollet))
- **\[k8s]** Sort endpointslices to keep backend IPs consistent across rebuilds ([#&#8203;13406](traefik/traefik#13406) [@&#8203;kevinpollet](https://github.com/kevinpollet))
- **\[kv]** Bump kvtools/redis to v1.2.1 ([#&#8203;13403](traefik/traefik#13403) [@&#8203;ldez](https://github.com/ldez))
- **\[middleware, authentication]** Fix x-forwarded-port in forward-auth ([#&#8203;13344](traefik/traefik#13344) [@&#8203;juliens](https://github.com/juliens))
- **\[middleware, k8s/gatewayapi]** Fix Gateway API redirect missing statuses ([#&#8203;13360](traefik/traefik#13360) [@&#8203;AnatoleLucet](https://github.com/AnatoleLucet))
- **\[middleware, k8s/gatewayapi]** Fix Host header not being modified by RequestHeaderModifier ([#&#8203;12805](traefik/traefik#12805) [@&#8203;mihuross](https://github.com/mihuross))
- **\[middleware, k8s/gatewayapi]** Fix request scheme derivation when Gateway API RequestRedirect omits scheme ([#&#8203;13347](traefik/traefik#13347) [@&#8203;gndz07](https://github.com/gndz07))
- **\[middleware]** Fix CORS Max-Age set to 0 by default ([#&#8203;13371](traefik/traefik#13371) [@&#8203;AnatoleLucet](https://github.com/AnatoleLucet))
- **\[middleware]** Fix CORS wildcard when allow-credentials is true ([#&#8203;13368](traefik/traefik#13368) [@&#8203;AnatoleLucet](https://github.com/AnatoleLucet))
- **\[server]** Add an option to remove request headers with underscores ([#&#8203;13262](traefik/traefik#13262) [@&#8203;youkoulayley](https://github.com/youkoulayley))
- **\[server]** Configurable max request header size ([#&#8203;13353](traefik/traefik#13353) [@&#8203;juliens](https://github.com/juliens))
- **\[tls]** Fix nondeterministic TLS certificate selection on shared SAN ([#&#8203;13348](traefik/traefik#13348) [@&#8203;rtribotte](https://github.com/rtribotte))
- **\[webui]** Bump axios to v1.18.0 ([#&#8203;13380](traefik/traefik#13380) [@&#8203;gndz07](https://github.com/gndz07))
- **\[websocket]** Fix connection upgrades when backend server is using h2c scheme ([#&#8203;12967](traefik/traefik#12967) [@&#8203;stffabi](https://github.com/stffabi))

**Documentation:**

- **\[k8s/crd]** Fix broken CRD reference links in IngressRoute page ([#&#8203;13375](traefik/traefik#13375) [@&#8203;s3onghyun](https://github.com/s3onghyun))
- **\[k8s/gatewayapi]** Remove experimental note for Gateway API/TLSRoute documentation ([#&#8203;13392](traefik/traefik#13392) [@&#8203;jnoordsij](https://github.com/jnoordsij))
- **\[k8s/ingress-nginx]** Add Kubernetes Ingress NGINX to the providers list ([#&#8203;13372](traefik/traefik#13372) [@&#8203;nmengin](https://github.com/nmengin))
- **\[k8s]** Align Helm chart documented values with chart v41 ([#&#8203;13366](traefik/traefik#13366) [@&#8203;mloiseleur](https://github.com/mloiseleur))
- **\[middleware, authentication, k8s/ingress-nginx]** Clarify intentional auth-response-headers gating and absence of stripping incoming X-Forwarded-\* headers ([#&#8203;13342](traefik/traefik#13342) [@&#8203;rtribotte](https://github.com/rtribotte))
- **\[middleware]** Clarify entryPoint middleware reference format ([#&#8203;13364](traefik/traefik#13364) [@&#8203;mloiseleur](https://github.com/mloiseleur))
- **\[security]** Add HTTP/2 header memory exhaustion security documentation ([#&#8203;13381](traefik/traefik#13381) [@&#8203;emilevauge](https://github.com/emilevauge))
- Adds documentations on maxHeaderBytes ([#&#8203;13363](traefik/traefik#13363) [@&#8203;juliens](https://github.com/juliens))
- Fix inaccuracies in reference documentation ([#&#8203;13304](traefik/traefik#13304) [@&#8203;sheddy-traefik](https://github.com/sheddy-traefik))

</details>

---

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This PR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4xNTAuMSIsInVwZGF0ZWRJblZlciI6IjQzLjE1MC4xIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119-->

Reviewed-on: https://git.jfreudenberger.de/JuliusFreudenberger/nix-config/pulls/16
Co-authored-by: Renovate Bot <[email protected]>
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