VulnerabilityThe Hacker News
7.8 — HIGH
New PHP Composer Flaws Enable Arbitrary Command Execution — Patches Released
Two high-severity security vulnerabilities have been disclosed in Composer, a package manager for PHP, that, if successfully exploited, could result in arbitrary command execution. The vulnerabilities have been described as command injection flaws affecting the Perforce VCS (version control software) driver. Details of the two flaws are below - CVE-2026-40176 (CVSS
🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview
Two high-severity security vulnerabilities have been discovered in Composer, a package manager for PHP, allowing arbitrary command execution if successfully exploited. The vulnerabilities affect versions 1.0 through 2.2.26 and 2.3 through 2.9.5 of Composer.
⚙️Technical Details
CVEs
CVE-2026-40176
Affected Systems
Composer package manager for PHP
Attack Vectors
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
💥Impact Assessment
Severity: H
Who Is at Risk
Developers and organizations using Composer versions 1.0 through 2.2.26 and 2.3 through 2.9.5
🛡️Recommended Actions
1Update Composer to version 2.3.6 or higher
2Disable the Perforce VCS driver in Composer until a patch is available
3Monitor for suspicious activity and implement additional security measures
📦Affected Products
Composer package manager for PHP
🔐NVD Verified DataVERIFIED
CVE-2026-40176 ↗CVSS 7.8 — HIGH
Attack Vector
LOCAL
Complexity
LOW
Vector String
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HWeaknesses
CWE-78CWE-20
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