HIGH

CVE-2026-114637

CVSS v3

8.7

HIGH

EPSS Score

—

exploit probability

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-114637 yet.

Full record on NVD

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.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Published: 2026-10-22
Last Modified: 2026-10-22

Frequently asked questions

What is CVE-2026-114637?

Is CVE-2026-114637 actively exploited?

Active exploitation of CVE-2026-114637 has not been confirmed.

What is the CVSS score for CVE-2026-114637?

CVE-2026-114637 has a CVSS v3 base score of 8.7 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N.

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