High 8.7Published Oct 21, 2026

CVE-2026-114640Traefik v3.7.0 before v3.7.14 mTLS Header Spoofing via Ingress-NGINX HTTP Router

Updated under an hour ago (Oct 28, 2026, 8:00 AM ET)

Does this affect you?

It affects traefik. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.20%, higher than 10% of scored CVEs.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for traefik

Exploited in the last 30 days

Traefik from v3.7.0 before v3.7.14 contains an authentication bypass vulnerability in its Kubernetes Ingress-NGINX provider that forwards client-supplied Ssl-Client-* headers on the plaintext HTTP router. When ssl-redirect is disabled alongside auth-tls-pass-certificate-to-upstream, unauthenticated attackers can send Ssl-Client-Verify: SUCCESS with a chosen certificate subject and issuer to impersonate mTLS identities.

CVSS: 8.7 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Weakness (CWE): CWE-290
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.20% (percentile 10)
Assigned by: VulnCheck
NVD analysis: Analyzed
Record last updated: Oct 27, 2026
First seen by InfoSec Signals: Oct 21, 2026

Affected products

Affected products

traefik traefik traefik:traefik (from the name)	from 3.7.0 before 3.7.14; 3.7.14 not affected	CNA record
traefik traefik traefik:traefik	from 3.7.0 before 3.7.14	NVD

References

References

https://github.com/traefik/traefik/security/advisories/GHSA-mwrr-6hp4-pxr6	vendor-advisory
https://www.vulncheck.com/advisories/traefik-3.7.0-before-3.7.14-mtls-header-spoofing-via-ingress-nginx-http-router	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.