CVE-2026-114639 Traefik - Authentication Bypass

Traefik 2.11.0 < 2.11.58 and 3.0.0 < 3.7.14 contain an authentication bypass caused by shared backend connection pool socket reuse with preauthenticated Authorization: Negotiate tokens, letting unauthenticated attackers perform actions as victim, exploit requires unauthenticated attacker on separate frontend connections.

CVSS base score 8.7 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.31% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication, Data Tampering, Information Disclosure
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-287

Vendor fix

Upgrade to versions 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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