8.7

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

Analyzed
Published 22-10-2026Last modified 28-10-2026

Vulnerability summary

CVE-2026-114640 is a high (CVSS 8.7) Authentication Bypass by Spoofing vulnerability in traefik. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8.9% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 04-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
8.7/10
010
High · v3.1 (CVE.org)
EPSS score
0.19%
0%100%
Low · Change unavailable
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:12281-1

Timeline

  1. 22-10-2026
    PublishedVulnerability first disclosed.
  2. 28-10-2026
    Last modifiedVulnerability information updated.

Description

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 metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

0.19%

Chance of exploitation in the next 30 days

Percentile

9%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

22-10-202604-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Traefik1 product

1 vendor · 1 product

References

2 links