Improper Authentication in Traefik Kubernetes Ingress by Traefik
CVE-2026-114638

7HIGH

Key Information:

Vendor

Traefik

Status
Traefik
Vendor
CVE Published:
22 October 2026

What is CVE-2026-114638?

Traefik versions prior to v3.7.14 exhibit an improper authentication vulnerability within the Kubernetes Ingress NGINX provider. This flaw arises from the merging of client certificates when the names of auth-tls-secrets collide after normalization. As a result, attackers may misappropriate certificates from different hosts, undermining the security of intended users. Legitimate clients may be unjustly denied access, allowing unauthorized parties access to resources designed to be protected.

Affected Version(s)

traefik 3.7.0 < 3.7.14

traefik 3.7.14

References

https://github.com/traefik/traefik/security/advisories/GH...
vendor-advisory
https://www.vulncheck.com/advisories/traefik-3.7.0-before...
third-party-advisory

CVSS V4

Score:
7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

scofaild23
.