Detections
Analytics

Echo: github.com/traefik/traefik/v3: security update to 2.11.56

medium Tenable Self-Hosted Container Security Plugin ID 463419

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/v3 library and its related packages to version 2.11.56 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-88011

Plugin Details

Severity: Medium

ID: 463419

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/3/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.47

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.3

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

CVSS Score Source: CVE-2026-88011

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.1

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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: 9/29/2026

Vulnerability Publication Date: 9/10/2026

Reference Information

CVE: CVE-2026-88011