CVE-2026-114637

High

Description

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.

SeverityHigh

CVSS8.7

Exploit probability—

Product

Traefik

PublishedOct 22, 2026

First seenOct 22, 2026

Weakness typeCWE-488CWE-488

How to fix

Update

traefik traefik3.7.14 or later

Vendor advisories

github.com/traefik/traefik/security/advisories/GHSA-53qr-784g-cj35

Affected products

Product	Affected versions	Fixed in
traefik traefik	3.2.0 ≤ v < 3.7.14	3.7.14

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