CVE-2026-112778

What it is

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.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. Limited direct impact.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-10-19 20:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-23 17:04 UTC Last updatedMost recent change to the record

Details

Published

2026-10-19 20:17 UTC

Last modified

2026-10-23 17:04 UTC

Exploit probability

0.2% · EPSS, next 30 days

Weakness

CWE-862 · Missing authorization

Record status

Analyzed

Affected

• Traefik < 2.11.46
• Traefik < 3.6.16
• Traefik 3.7.0

Attack profile CVSS 4.0 · 6.4

Attack vector

Network

Complexity

Low

Attack requirements

None

Privileges needed

Low

User interaction

None

Confidentiality

None

Integrity

None

Availability

None