Traefik 2.11.x before 2.11.58 and 3.x before 3.7.14 contains a race condition in NTLM and Kerberos (Negotiate) backend authentication, where the per-connection sticky round tripper slot is read and written without synchronization. Remote attackers can send concurrent HTTP/2 or HTTP/3 requests over one connection to orphan backend connections, break connection-bound authentication, or crash Traefik.
Advisories

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Fixes

Solution

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Workaround

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History

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

Type Values Removed Values Added
Description Traefik 2.11.x before 2.11.58 and 3.x before 3.7.14 contains a race condition in NTLM and Kerberos (Negotiate) backend authentication, where the per-connection sticky round tripper slot is read and written without synchronization. Remote attackers can send concurrent HTTP/2 or HTTP/3 requests over one connection to orphan backend connections, break connection-bound authentication, or crash Traefik.
Title Traefik before 2.11.58 and 3.7.14 Race Condition in NTLM/Kerberos Round Tripper
First Time appeared Traefik
Traefik traefik
Weaknesses CWE-362
CPEs cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*
Vendors & Products Traefik
Traefik traefik
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}

cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-22T01:43:40.663Z

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

Link: CVE-2026-114641

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-22T02:16:57.093

Modified: 2026-10-22T02:16:57.093

Link: CVE-2026-114641

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses