CVE-2026-114642 Traefik - Authentication Bypass

Traefik 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 contains a broken authentication caused by NTLM/Kerberos backend round tripper reuse across services, letting unauthenticated clients bypass TLS verification on backend services, exploit requires backend issuing NTLM or Negotiate challenge.

CVSS base score 8.7 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Published
22 October 2026
Updated
23 October 2026
Weakness
CWE-295

Vendor fix

Update to version 2.11.58, 3.7.14 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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