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SCA: security update for github.com/traefik/traefik/v2, github.com/traefik/traefik/v3 (GHSA-6x2q-h3cr-8j2h)

medium Tenable Cloud Security Plugin ID 441337

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 2.11.43, 3.6.14, and 3.7.0-rc.2,
 there is a timing side-channel vulnerability in Traefik's BasicAuth middleware that allows an attacker to
 enumerate valid usernames through response-time differences. The variable intended to hold a constant-time
 fallback secret always resolves to an empty string, causing the constant-time comparison to short-circuit
 in microseconds rather than performing a full bcrypt evaluation. This restores the original timing oracle
 and makes it possible to distinguish existing users from non-existing ones by measuring authentication
 response times. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2. (CVE-2026-41263)

Solution

Update the github.com/traefik/traefik/v2 library and its related packages to version 2.11.43 or later.

See Also

https://github.com/advisories/GHSA-6x2q-h3cr-8j2h

Plugin Details

Severity: Medium

ID: 441337

Version: Revision 1.5

Type: Local

Family: SCA Checks

Published: 5/7/2026

Updated: 7/6/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Low

Base Score: 2.6

Temporal Score: 1.9

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

CVSS Score Source: CVE-2026-41263

CVSS v3

Risk Factor: Low

Base Score: 3.7

Temporal Score: 3.2

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

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

CVSS v4

Risk Factor: Medium

Base Score: 6.3

Threat Score: 1.7

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 4/24/2026

Vulnerability Publication Date: 4/24/2026

Reference Information

CVE: CVE-2026-41263

cwe: CWE-208