OS Command Injection in composer - CVE-2026-84361

Vulnerability identifier: #VU146003

CSH Severity: High

CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-84361

CWE-ID: CWE-78

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to execute arbitrary commands.

The vulnerability exists due to command injection in the Perforce source URL handling in Composer when processing a malicious package's Perforce source address during install or update. A remote attacker can provide a specially crafted package source URL to execute arbitrary commands.

The issue is exploitable only if the Perforce p4 client is installed and available on the PATH, and the package is installed from source. User interaction is required to run composer install or composer update.

composer
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
Web and Scripting Module
openSUSE Leap
php-composer2

Install security update from vendor's website.

composer - addressed in versions 2.2.30, 2.10.3
php-composer2 - addressed in versions 2.2.30-150400.3.21.1, 2.6.4-150600.3.18.1

• https://github.com/composer/composer/security/advisories/GHSA-rvx4-ffvw-m9q3

• Multiple vulnerabilities in composer
• SUSE update for php-composer2
• SUSE update for php-composer2