CVE-2026-41263

Published: Apr 30, 2026 Last Modified: Mag 01, 2026
ExploitDB:
Other exploit source:
Google Dorks:
MEDIUM 6,3
Source: [email protected]
Attack Vector: network
Attack Complexity: high
Privileges Required: none
User Interaction: none
Confidentiality: N/A
Integrity: N/A
Availability: N/A
LOW 3,7
Source: [email protected]
Attack Vector: network
Attack Complexity: high
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: low
Integrity: none
Availability: none

Description

AI Translation Available

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a timing side-channel vulnerability in Traefik's BasicAuth middleware that allows an attacker to enumerate valid usernames through response-time differences. The variable intended to hold a constant-time fallback secret always resolves to an empty string, causing the constant-time comparison to short-circuit in microseconds rather than performing a full bcrypt evaluation. This restores the original timing oracle and makes it possible to distinguish existing users from non-existing ones by measuring authentication response times. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,0001
Percentile
0,0th
Updated

Single Data Point

Only one EPSS measurement is available for this CVE. Trend analysis requires multiple data points over time.

208

Observable Timing Discrepancy

Incomplete
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Confidentiality Access Control
Potential Impacts:
Read Application Data Bypass Protection Mechanism
Applicable Platforms
All platforms may be affected
View CWE Details
Application

Traefik by Traefik

Product Information
Vendor Traefik
Product Traefik
Version Range Affected
To 2.11.43 (exclusive)
cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Traefik by Traefik

Product Information
Vendor Traefik
Product Traefik
Version 3.7.0
cpe:2.3:a:traefik:traefik:3.7.0:ea1:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Traefik by Traefik

Product Information
Vendor Traefik
Product Traefik
Version 3.7.0
cpe:2.3:a:traefik:traefik:3.7.0:rc1:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Traefik by Traefik

Product Information
Vendor Traefik
Product Traefik
Version Range Affected
From 3.0.0 (inclusive)
To 3.6.14 (exclusive)
cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Traefik by Traefik

Product Information
Vendor Traefik
Product Traefik
Version 3.7.0
cpe:2.3:a:traefik:traefik:3.7.0:ea2:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Traefik by Traefik

Product Information
Vendor Traefik
Product Traefik
Version 3.7.0
cpe:2.3:a:traefik:traefik:3.7.0:ea3:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
https://github.com/traefik/traefik/releases/tag/v2.11.43
https://github.com/traefik/traefik/releases/tag/v2.11.43
https://github.com/traefik/traefik/releases/tag/v3.6.14
https://github.com/traefik/traefik/releases/tag/v3.6.14
https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2
https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2
https://github.com/traefik/traefik/security/advisories/GHSA…
https://github.com/traefik/traefik/security/advisories/GHSA-6x2q-h3cr-8j2h