High severity · published Oct 22, 2026
CVE-2026-114638
Traefik v3.7.0 before v3.7.14 Client CA Mix-up via auth-tls-secret Name Collision
New
8.7
CVSS
0.2%
EPSS
No
On KEV
Description
Traefik v3.7.0 before v3.7.14 contains an improper authentication vulnerability in the Kubernetes Ingress NGINX provider that merges client CAs when auth-tls-secret names collide after dot-to-dash normalization. Attackers holding certificates from another host's CA can access a host requiring its own client CA, while that host's legitimate clients are refused.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 12% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TR
traefik · traefik
3.7.0 before 3.7.14 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-114638
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-114638
Vendor Advisory
https://github.com/traefik/traefik/security/advisories/GHSA-rv2h-qh7j-xrjw
Third Party Advisory
https://www.vulncheck.com/advisories/traefik-3.7.0-before-3.7.14-client-ca-mix-up-via-auth-tls-secret-name-collision
More from traefik
10.0
CVE-2026-54763
Traefik: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth
10.0
CVE-2026-53622
Traefik: HTTP/3 mTLS bypass via exact SNI TLSOptions lookup for wildcard and mixed-case hosts
10.0
CVE-2026-48491
Traefik: SNICheck ignores wildcard TLSOptions mappings, allowing domain-fronted mTLS bypass
10.0
CVE-2026-48020
Traefik StripPrefix Route-Level Auth Bypass via Path Normalization
10.0
CVE-2026-39858
Traefik: Forwarded alias spoofing top pre-auth decision bypass