Detections
Analytics

SCA: security update for Traefik (GHSA-5r4w-85f3-pw66)

high Tenable Cloud Security Plugin ID 443295

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. From 3.7.0 until 3.7.3, there is a high severity
 vulnerability in Traefik's domain-fronting protection (SNICheck) that allows an unauthenticated client to
 bypass mutual TLS enforced through wildcard router TLSOptions. When a router uses a wildcard host rule
 such as Host(*.example.com) with stricter TLS options (for example RequireAndVerifyClientCert), SNICheck
 resolves the TLS options for the HTTP Host header using exact map lookups only and never applies wildcard
 matching. If another permissive SNI is served on the same entrypoint, an attacker can complete the TLS
 handshake under the permissive options and then send an HTTP Host header targeting the wildcard-protected
 backend, reaching it without presenting a client certificate. This affects the regular HTTPS / HTTP-2 path
 and does not require HTTP/3. This vulnerability is fixed in 3.7.3. (CVE-2026-48491)

Solution

Update the Traefik library and its related packages to version 3.7.3 or later.

See Also

https://github.com/advisories/GHSA-5r4w-85f3-pw66

Plugin Details

Severity: High

ID: 443295

Version: Revision 1.5

Type: Local

Family: SCA Checks

Published: 6/16/2026

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-2026-48491

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: 6/16/2026

Vulnerability Publication Date: 6/14/2026

Reference Information

CVE: CVE-2026-48491

cwe: CWE-288