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.
Published: 2026-10-22
Score: 7 High
EPSS: < 1% Very Low
KEV: No
AI Analysis

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Remediation

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Tracking

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Advisories

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History

Wed, 04 Nov 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 22 Oct 2026 02:00:00 +0000

Type Values Removed Values Added
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.
Title Traefik before 2.11.58 and 3.7.14 Authentication Bypass via Negotiate Connection Pool
First Time appeared Traefik
Traefik traefik
Weaknesses CWE-287
CPEs cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*
Vendors & Products Traefik
Traefik traefik
References
Metrics cvssV3_1

{'score': 8.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N'}

cvssV4_0

{'score': 7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-04T16:00:11.984Z

Reserved: 2026-10-21T21:57:36.197Z

Link: CVE-2026-114639

cve-icon Vulnrichment

Updated: 2026-11-04T16:00:04.675Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-22T02:16:56.800

Modified: 2026-11-04T16:17:41.760

Link: CVE-2026-114639

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-22T08:45:02Z

Weaknesses