CVE-2026-29777 Traefik has a kubernetes gateway rule injection via unescaped backticks in HTTPRoute match values
Attackers with HTTPRoute write access can inject rule tokens to bypass hostname constraints and redirect traffic to malicious backends.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-29777?
CVE-2026-29777 is a medium-severity code injection vulnerability in Traefik Traefik, published on 11 Mar 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-74
Which versions are affected by CVE-2026-29777?
9 open source packages ship an affected version, including github.com/traefik/traefik, github.com/traefik/traefik/v2 and github.com/traefik/traefik/v3. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/traefik/traefik Go | All versions | None |
github.com/traefik/traefik Go | All versions to 1.7.34 | None |
github.com/traefik/traefik Go | All versions to 1.7.34 | None |
github.com/traefik/traefik/v2 Go | All versions | None |
github.com/traefik/traefik/v2 Go | All versions to 2.11.40 | None |
github.com/traefik/traefik/v2 Go | All versions to 2.11.40 | None |
3 more packages
github.com/traefik/traefik/v3 Go | All versions | 3.6.10 |
github.com/traefik/traefik/v3 Go | All versions | 3.6.10 |
github.com/traefik/traefik/v3 Go | All versions | 3.6.10 |
Products include Traefik Traefik.
How do I fix CVE-2026-29777?
Upgrade to a fixed version.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-29777 being exploited?
There is no known exploitation of CVE-2026-29777 in the wild and no public exploit code.
Other vulnerabilities in Traefik Traefik
- CVE-2024-45410 HTTP client can remove the X-Forwarded headers in Traefik
- CVE-2026-88877 Traefik v3.7.0 Authentication Bypass via from-to-www-redirect
- CVE-2026-85595 Traefik before v2.11.55 and v3.0.0 through v3.7.10 Authentication Bypass via digestAuth
- CVE-2026-88007 Traefik HTTP/3 Backend NTLM Connection Reuse
- CVE-2026-88009 Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging
Sources
Also known as GHSA-8q2w-wr49-whqj, GO-2026-4679, MINI-g8f9-rfjc-3fmc, MINI-jm7w-749h-gh8r, MINI-w6vg-3mm8-6834.