Vulnerability in Traefik
CVE-2026-114637
Traefik from v3.2.0 before v3.7.14 contains an authentication bypass vulnerability in the experimental FastProxy connection pool, which fails to pin NTLM/Negotiate-authenticated backend connections to their frontend connection. Unauthenticated clients can be handed a pooled keep-alive backend connection where a victim completed an NTLM or Negotiate handshake, letting them read victim data and act as that victim.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/traefik/traefik/security/advisories/GHSA-53qr-784g-cj35 (vendor-advisory)
- www.vulncheck.com/advisories/traefik-3.2.0-before-3.7.14-fastproxy-ntlm-negotia… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-114637?
- CVE-2026-114637 is a high-severity vulnerability in Traefik, classified under CWE-488. CVSS score: 8.7/10. Published 2026-10-22.
- How severe is CVE-2026-114637?
- High severity. CVSS v3 base score is 8.7 out of 10.