Cross-namespace backend hijacking via colliding route identities
Published Aug 6, 2026 · Updated Aug 6, 2026
Duplicate route identities in Traefik Proxy 3.0.0 through 3.6.24 and 3.7.0 through 3.7.9 allow remote authenticated users to hijack traffic. The Kubernetes Gateway provider normalizes delimiter-joined namespace, route, Gateway, entry-point, and rule values without preserving field boundaries, then overwrites existing router and service map entries when keys collide. Exploitation requires permission to create an accepted Route on a shared Gateway and a favorable namespace/name collision, exposing victim requests and credentials to an attacker-controlled backend and enabling forged responses.
Summary
What happened
Duplicate route identities in Traefik Proxy 3.0.0 through 3.6.24 and 3.7.0 through 3.7.9 allow remote authenticated users to hijack traffic. The Kubernetes Gateway provider normalizes delimiter-joined namespace, route, Gateway, entry-point, and rule values without preserving field boundaries, then overwrites existing router and service map entries when keys collide. Exploitation requires permission to create an accepted Route on a shared Gateway and a favorable namespace/name collision, exposing victim requests and credentials to an attacker-controlled backend and enabling forged responses.
The record
- CVE
- CVE-2026-71327
- Published
- Aug 6, 2026
- Updated
- Aug 6, 2026
- Vendor
- Traefik Labs
- Product
- Traefik Proxy
- Classifications
- CWE-694, T1557, T1565.002
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 6, 2026CVE publishedPublication date reported by the CVE source.
- Aug 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 3.0.0, < 3.6.25
- Affected versionversion=>= 3.7.0, < 3.7.10
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Upstream colliding Route proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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