Path traversal in composer - #VU136613
Published: July 1, 2026
Vulnerability identifier: #VU136613
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: getcomposer.org
Affected software:
composer
composer
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to path traversal in the bin field processing in Composer when installing a package with crafted bin entries containing .. path segments. A remote attacker can trick the victim into installing a malicious dependency to disclose sensitive information.
The issue changes file permissions of an existing target file to make it world-readable and world-executable, and user interaction is required to install, update, or require the dependency.
Remediation
Install security update from vendor's website.