SCA: security update for github.com/traefik/traefik/v2, github.com/traefik/traefik/v3 (GHSA-rf44-j88r-hh8c)

medium Tenable Self-Hosted Container Security Plugin ID 447933

Description

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

- Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.56, and from 3.0.0 until
3.7.12, a client-supplied dot-form header such as X.Authenticated.User survives ForwardAuth replacement
and underscoreHeadersStrategy because Go treats it as distinct from X-Authenticated-User while
normalization-prone CGI, WSGI, PHP, and NGINX backends collapse both names. A backend can consequently
consume the client value instead of the identity Traefik asserted, allowing identity spoofing for any
header managed by Traefik. The aliasHeadersStrategy protection is disabled by default and must be
configured as delete or reject. The mitigation is available in 2.11.56 and 3.7.12. (CVE-2026-88011)

Solution

Update the github.com/traefik/traefik/v2 library and its related packages to version 2.11.56 or later.

Plugin Details

Severity: Medium

ID: 447933

Version: Revision 1.1

Type: Local

Family: SCA Checks

Published: 9/11/2026

Updated: 9/11/2026

Risk Information

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Low

Base Score: 3.5

Temporal Score: 2.6

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

CVSS Score Source: CVE-2026-88011

CVSS v3

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.8

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

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

CVSS v4

Risk Factor: Medium

Base Score: 5.3

Threat Score: 1.3

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 9/10/2026

Vulnerability Publication Date: 9/10/2026

Reference Information

CVE: CVE-2026-88011

cwe: CWE-290

Detections

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