Detections
Analytics

SCA: security update for github.com/traefik/traefik/v2, github.com/traefik/traefik/v3 (GHSA-5m6w-wvh7-57vm)

high Tenable Cloud Security Plugin ID 440801

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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 high severity authentication bypass vulnerability in Traefik's ForwardAuth and snippet-based
 authentication middleware. Traefik's forwarded-header sanitization logic targets only canonical header
 names (e.g., X-Forwarded-Proto) and does not strip or normalize alias variants that use underscores
 instead of dashes (e.g., X_Forwarded_Proto). These unsanitized alias headers are forwarded intact to the
 authentication backend. When the backend normalizes underscore and dash header forms equivalently, an
 attacker can inject spoofed trust context — such as a trusted scheme or host — through the alias headers
 and bypass authentication on protected routes without valid credentials. This issue has been patched in
 versions 2.11.43, 3.6.14, and 3.7.0-rc.2. (CVE-2026-39858)

Solution

Update the github.com/traefik/traefik/v2 library and its related packages to version 2.11.43 or later.

See Also

https://github.com/advisories/GHSA-5m6w-wvh7-57vm

Plugin Details

Severity: High

ID: 440801

Version: Revision 1.9

Type: Local

Family: SCA Checks

Published: 4/24/2026

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.8

Percentile: 57.75

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N

CVSS Score Source: CVE-2026-39858

CVSS v3

Risk Factor: Critical

Base Score: 10

Temporal Score: 9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 7.8

Threat Score: 6.8

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/24/2026

Vulnerability Publication Date: 4/24/2026

Reference Information

CVE: CVE-2026-39858