CVE-2026-32595

MEDIUM EPSS 30.4%
Published Mar 20, 20263mo ago · Modified Jun 17, 20262w ago
6.3 CVSS 4.0
Medium
Find Similar
Published Mar 20, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago

Description

Traefik is an HTTP reverse proxy and load balancer. Versions 2.11.40 and below, 3.0.0-beta1 through 3.6.11, and 3.7.0-ea.1 comtain BasicAuth middleware that allows username enumeration via a timing attack. When a submitted username exists, the middleware performs a bcrypt password comparison taking ~166ms. When the username does not exist, the response returns immediately in ~0.6ms. This ~298x timing difference is observable over the network and allows an unauthenticated attacker to reliably distinguish valid from invalid usernames. This issue is patched in versions 2.11.41, 3.6.11 and 3.7.0-ea.2.

CVSS Details

Base Score
6.3
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
30.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-208

Affected Products 3

VendorProductVersionRange
traefiktraefik* <2.11.41
traefiktraefik*≥3.0.0  –  ≤3.6.11
traefiktraefik3.7.0any

References 4

  • github.com https://github.com/traefik/traefik/releases/tag/v2.11.41
    Release Notes
  • github.com https://github.com/traefik/traefik/releases/tag/v3.6.11
    Release Notes
  • github.com https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.2
    Release Notes
  • github.com https://github.com/traefik/traefik/security/advisories/GHSA-g3hg-j4jv-cwfr
    PatchVendor Advisory

Remediation

  • github.com https://github.com/traefik/traefik/security/advisories/GHSA-g3hg-j4jv-cwfr
    PatchVendor Advisory