CVE-2026-114642

high

Traefik 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 stores its NTLM/Kerberos backend round tripper in a client-connection slot not keyed by ServersTransport,…

Vendor / product: Traefik — traefik

Traefik 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 stores its NTLM/Kerberos backend round tripper in a client-connection slot not keyed by ServersTransport, so one service's TLS client configuration is reused for another service's backend. An unauthenticated client can arm the slot via a backend issuing an NTLM or Negotiate challenge, then reach another service on the same keep-alive connection, bypassing its root CAs, server name, and certificate verification.

CVSS

8.7

8.7 (CVSS v3.1)

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

Severity source: NVD CVSS v3.1 (disclosure@vulncheck.com)

Timeline (UTC)

Published: 2026-10-22 02:16

Modified: 2026-10-27 14:13

NVD status: Analyzed

Last synced 18 hours ago

Verified against the source API 2026-10-28 11:30 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

traefik / traefik ≥2.11.0 <2.11.58, ≥3.0.0 <3.7.14

Weakness classification (CWE)

CWE-295

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

Vendor advisory: https://github.com/traefik/traefik/security/advisories/GHSA-cw35-4q88-3rmp

References

https://github.com/traefik/traefik/security/advisories/GHSA-cw35-4q88-3rmp disclosure@vulncheck.com
https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.14-tls-config-bypass-v... disclosure@vulncheck.com

Data sources

NVD CVE API 2.0 — fetched 2026-10-28 11:30 UTC · record ↗

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CVE-2026-114642

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