CVE-2026-114637CWE-488

CVE-2026-114637

High · published October 22, 2026

CVSS v3.1
8.7
EPSS
0%
Percentile
21.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.7 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
CVSS v4.0
7.0 · 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
EPSS
0.00299 · 21.5th percentile
Weakness
CWE-488 · Exposure of Data Element to Wrong Session
Published
2026-10-22T06:16Z
References (2)
https://github.com/traefik/traefik/security/advisories/GHSA-53qr-784g-cj35 · [email protected]https://www.vulncheck.com/advisories/traefik-3.2.0-before-3.7.14-fastproxy-ntlm-negotiate-connection-pool-identity-leak · [email protected]
EPSS history
Timeline
  • 23 OCT 03:55Z
    EPSS moved — → 0%
    epss
  • 22 OCT 01:43Z
    Traefik v3.2.0 before v3.7.14 FastProxy NTLM/Negotiate Connection Pool Identity Leak
    cvelistv5
  • 22 OCT 01:43Z
    Traefik v3.2.0 before v3.7.14 FastProxy NTLM/Negotiate Connection Pool Identity Leak
    cvelistv5