CVE-2026-41181

MEDIUM EPSS 35.6%
Published May 15, 20261mo ago · Modified Jun 17, 20261w ago
6.9 CVSS 4.0
Medium
Find Similar
Published May 15, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

Description

Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.44, 3.6.15, and 3.7.0-rc.3, there is an information disclosure vulnerability in Traefik's errors (custom error pages) middleware. When the backend returns a response matching the configured status range, the middleware forwards the original request's complete header set, including Authorization, Cookie, and other authentication material, to the separate error page service rather than only the minimal context needed to render the error page. This behavior is undocumented: the documentation states only that Host is forwarded by default, so operators are not warned that sensitive credentials are shared across service boundaries. Deployments using the errors middleware with a distinct error page service may inadvertently expose end-user credentials to infrastructure that was not intended to receive them. This vulnerability is fixed in 2.11.44, 3.6.15, and 3.7.0-rc.3.

CVSS Details

Base Score
6.9
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/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 Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
35.6% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-201

Affected Products 7

VendorProductVersionRange
traefiktraefik* <2.11.44
traefiktraefik*≥3.0.0  –  <3.6.15
traefiktraefik3.7.0any
traefiktraefik3.7.0any
traefiktraefik3.7.0any
traefiktraefik3.7.0any
traefiktraefik3.7.0any

References 4

  • github.com https://github.com/traefik/traefik/releases/tag/v2.11.44
    ProductRelease Notes
  • github.com https://github.com/traefik/traefik/releases/tag/v3.6.15
    ProductRelease Notes
  • github.com https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.3
    ProductRelease Notes
  • github.com https://github.com/traefik/traefik/security/advisories/GHSA-p6hg-qh38-555r
    ExploitMitigationPatchVendor Advisory

Remediation

  • github.com https://github.com/traefik/traefik/security/advisories/GHSA-p6hg-qh38-555r
    ExploitMitigationPatchVendor Advisory