Vulnerability · Published Mar 11, 2026 · Assigned by GitHub_M

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

Medium 6.1

In plain English

A medium-severity injection in traefik from traefik. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.1Medium

Exploit odds (30 days)0.3%top 75.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/traefik/traefik	no fix listed	GHSA-8q2w-wr49-whqj
Go	github.com/traefik/traefik	no fix listed	GO-2026-4679
Go	github.com/traefik/traefik/v2	no fix listed	GHSA-8q2w-wr49-whqj
Go	github.com/traefik/traefik/v2	no fix listed	GO-2026-4679
Go	github.com/traefik/traefik/v3	3.6.10	GHSA-8q2w-wr49-whqj
Go	github.com/traefik/traefik/v3	3.6.10	GO-2026-4679

Affected products (as reported)

Vendor	Product	Versions
traefik	traefik	< 3.6.10

Weakness: CWE-74 · 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

References

https://github.com/traefik/traefik/security/advisories/GHSA-8q2w-wr49-whqj x_refsource_CONFIRM
https://github.com/traefik/traefik/releases/tag/v3.6.10 x_refsource_MISC