Traefik 2.11.x < 2.11.38 / 3.x < 3.6.9 Connection Header Bypass

high Nessus Plugin ID 318670

Synopsis

The remote macOS host is affected by a vulnerability.

Description

The version of Traefik installed on the remote macOS host is 2.11.x prior to 2.11.38 or 3.x prior to 3.6.9. It is, therefore, affected by a vulnerability:

- A flaw exists in HTTP/1.1 request handling due to case-sensitive comparison of Connection header tokens against protected header names. An unauthenticated, remote attacker can exploit this, via lowercase Connection tokens, to bypass protection and trigger the removal of Traefik-managed forwarded identity headers. (CVE-2026-29054)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Traefik version 2.11.38, 3.6.9, or later.

Plugin Details

Severity: High

ID: 318670

File Name: macos_traefik_cve_2026_29054.nasl

Version: 1.1

Type: Local

Agent: macosx

Family: MacOS X Local Security Checks

Published: 6/4/2026

Updated: 6/4/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.8

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

CVSS Score Source: CVE-2026-29054

CVSS v3

Risk Factor: High

Base Score: 7.5

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

Vulnerability Information

CPE: cpe:/a:traefik:traefik

Required KB Items: Host/local_checks_enabled, installed_sw/traefik

Patch Publication Date: 3/5/2026

Vulnerability Publication Date: 3/5/2026

Reference Information

CVE: CVE-2026-29054

IAVB: 2026-B-0059

Detections

Analytics