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SCA: security update for github.com/caddyserver/caddy/v2 (GHSA-hffm-g8v7-wrv7)

critical Tenable Self-Hosted Container Security Plugin ID 438003

Description

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

 - Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, two swallowed
 errors in `ClientAuthentication.provision()` cause mTLS client certificate authentication to silently fail
 open when a CA certificate file is missing, unreadable, or malformed. The server starts without error but
 accepts any client certificate signed by any system-trusted CA, completely bypassing the intended private
 CA trust boundary. Any deployment using `trusted_ca_cert_file` or `trusted_ca_certs_pem_files` for mTLS
 will silently degrade to accepting any system-trusted client certificate if the CA file becomes
 unavailable. This can happen due to a typo in the path, file rotation, corruption, or permission changes.
 The server gives no indication that mTLS is misconfigured. Version 2.11.1 fixes the vulnerability.
 (CVE-2026-27586)

See Also

https://github.com/advisories/GHSA-hffm-g8v7-wrv7

Plugin Details

Severity: Critical

ID: 438003

Version: Revision 1.7

Type: Local

Family: SCA Checks

Published: 2/27/2026

Updated: 7/2/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.59

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-2026-27586

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 8.2

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.3

Threat Score: 8.8

Threat Vector: CVSS:4.0/E:P

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

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2/24/2026

Vulnerability Publication Date: 2/24/2026

Reference Information

CVE: CVE-2026-27586

cwe: CWE-755