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SCA: security update for github.com/traefik/traefik/v2, github.com/traefik/traefik/v3 (GHSA-qr99-7898-vr7c)

medium Tenable Self-Hosted Container Security Plugin ID 478310

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 2.11.42, 3.6.11, and 3.7.0-ea.3,
 when `headerField` is configured with a non-canonical HTTP header name (e.g., `x-auth-user` instead of
 `X-Auth-User`), an authenticated attacker can inject their own canonical version of that header to
 impersonate any identity to the backend. The backend receives two header entries — the attacker-injected
 canonical one is read first, overriding Traefik's non-canonical write. Versions 2.11.42, 3.6.11, and
 3.7.0-ea.3 patch the issue. (CVE-2026-33433)

Solution

Update the github.com/traefik/traefik/v2 library and its related packages to version 2.11.42 or later.

See Also

https://github.com/advisories/GHSA-qr99-7898-vr7c

Plugin Details

Severity: Medium

ID: 478310

Version: Revision 1.1

Type: Local

Family: SCA Checks

Published: 11/4/2026

Updated: 11/4/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.03

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 7

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

CVSS Score Source: CVE-2026-33433

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.9

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

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

CVSS v4

Risk Factor: Medium

Base Score: 5.1

Threat Score: 2.3

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/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: 3/27/2026

Vulnerability Publication Date: 3/26/2026

Reference Information

CVE: CVE-2026-33433

cwe: CWE-290