CVE-2026-112778

Traefik before 2.11.46, 3.x before 3.6.17, and 3.7.0 lack namespace validation for Ingress and Service annotations in the Kubernetes Ingress provider, allowing references to Middlewares, ServersTransports, and TLSOptions in other namespaces. Attackers able to create or update Ingress or Service resources in one namespace can set router.middlewares or service.serverstransport annotations to obtain another tenant's injected credentials or reuse its client certificates, bypassing namespace-based tenant isolation.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/traefik/traefik/security/advisories/GHSA-rh7m-2m44-x32f	Vendor Advisory Patch
https://www.vulncheck.com/advisories/traefik-before-2.11.46-3.6.17-and-3.7.1-cross-namespace-resource-reference-via-kubernetes-annotations	Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:traefik:traefik::::::::
	cpe:2.3:a:traefik:traefik::::::::
	cpe:2.3:a:traefik:traefik:3.7.0:::::::*

History

23 Oct 2026, 17:04

Type	Values Removed	Values Added
First Time		Traefik Traefik traefik
CPE		cpe:2.3:a:traefik:traefik:::::::: cpe:2.3:a:traefik:traefik:3.7.0:::::::*
References	~~() https://github.com/traefik/traefik/security/advisories/GHSA-rh7m-2m44-x32f -~~	() https://github.com/traefik/traefik/security/advisories/GHSA-rh7m-2m44-x32f - Vendor Advisory, Patch
References	~~() https://www.vulncheck.com/advisories/traefik-before-2.11.46-3.6.17-and-3.7.1-cross-namespace-resource-reference-via-kubernetes-annotations -~~	() https://www.vulncheck.com/advisories/traefik-before-2.11.46-3.6.17-and-3.7.1-cross-namespace-resource-reference-via-kubernetes-annotations - Third Party Advisory
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 8.8

19 Oct 2026, 20:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-19 20:17

Updated : 2026-10-23 17:04

NVD link : CVE-2026-112778

Mitre link : CVE-2026-112778

CVE.ORG link : CVE-2026-112778

JSON object : View

Products Affected

traefik

traefik

CWE

CWE-862

Missing Authorization

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