CVE-2026-114637

Traefik v3.2.0 before v3.7.14 FastProxy NTLM/Negotiate Connection Pool Identity Leak

State: Published
Severity: 7.0 High
Published: Oct 22, 2026
Updated: Oct 28, 2026
Reserved: Oct 21, 2026

Description

Traefik from v3.2.0 before v3.7.14 contains an authentication bypass vulnerability in the experimental FastProxy connection pool, which fails to pin NTLM/Negotiate-authenticated backend connections to their frontend connection. Unauthenticated clients can be handed a pooled keep-alive backend connection where a victim completed an NTLM or Negotiate handshake, letting them read victim data and act as that victim.

Scores

CVSS	Score	Vector	Source
4.0	7.0 High	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	VulnCheck
3.1	8.7 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N	VulnCheck

Weaknesses

CWE-488 Exposure of Data Element to Wrong Session

Affected Products

Product	Versions
traefiktraefik	3.2.0 to before 3.7.14Affected 3.7.14Not affected

References

GitHub Security Advisory (GHSA-53qr-784g-cj35)vendor-advisory
VulnCheck Advisory: Traefik v3.2.0 before v3.7.14 FastProxy NTLM/Negotiate Connection Pool Identity Leakthird-party-advisory

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