CVE-2026-114639

High

Description

Traefik 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 contains an authentication bypass because a first request preauthenticated with an Authorization: Negotiate token authenticates a socket in the globally shared backend connection pool, which is never isolated. Unauthenticated attackers on separate frontend connections can be assigned that NTLM/Kerberos-bound socket and perform reads or writes with the victim's identity.

SeverityHigh

CVSS8.7

Exploit probability—

Product

Traefik

PublishedOct 22, 2026

First seenOct 22, 2026

Weakness typeCWE-287Improper authentication

How to fix

Update

traefik traefik2.11.58, 3.7.14 or later

Vendor advisories

github.com/traefik/traefik/security/advisories/GHSA-qm9f-w54v-q2qh

Affected products

Product	Affected versions	Fixed in
traefik traefik	2.11.0 ≤ v < 2.11.58, 3.0.0 ≤ v < 3.7.14	2.11.58, 3.7.14

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