6.5

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

Analyzed
AliasesGHSA-8q2w-wr49-whqjGO-2026-4679CGA-4rpj-5fww-xgxc
Published 11-03-2026Last modified 11-03-2026

Vulnerability summary

CVE-2026-29777 is a medium (CVSS 6.5) vulnerability in traefik. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 22% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 6.1, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.29%
0%100%
Low · -0.09 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 4
OPENSUSE-SU-2026:10385-1OPENSUSE-SU-2026:21483-1SUSE-SU-2026:1042-1CGA-6GVP-9C6W-X82R

Timeline

  1. 11-03-2026
    PublishedVulnerability first disclosed.
  2. 11-03-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.29%

Chance of exploitation in the next 30 days

Percentile

22%

Versus all other CVEs

30-day change

Decrease -0.09 pp

From 0.38% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard4 products
  • traefik-2.11< 2.11.41-r0 | < 2.11.42-r0
  • traefik-3.5All versions (No fix recorded)
  • traefik-fips-2.11< 2.11.41-r0
  • traefik-fips-3.5All versions (No fix recorded)
Github.com/traefik/traefik2 products
  • v2≤ 2.11.40 | All versions (No fix recorded)
  • v3< 3.6.10
Github.com/traefik1 product
  • traefik≤ 1.7.34 | All versions (No fix recorded)
Traefik1 product

4 vendors · 8 products

References

5 links