CVE-2026-114639

Traefik before 2.11.58 and 3.7.14 Authentication Bypass via Negotiate Connection Pool

HIGH
8.7
CVSS Score
Published: October 22, 2026 at 01:43 AM UTC
Updated: October 27, 2026 at 02:17 PM UTC
1 product affected across 1 vendorTraefik

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Severity
HIGH8.7
Exploit prediction
EPSS 0.3%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

2.11.0 ≤ v < 2.11.583.0.0 ≤ v < 3.7.14
Vendor states this is fixed in 2.11.58 (unaffected)
Vendor states this is fixed in 3.7.14 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

8.7HIGHVulnCheck
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-287

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