Path traversal in composer - CVE-2026-59946
Published: July 1, 2026
Vulnerability identifier: #VU136613
CSH Severity: Medium
CVSS v4: 6.8 [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]
CVE-ID: CVE-2026-59946
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
composer
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
Web and Scripting Module
openSUSE Leap
php-composer2
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
Web and Scripting Module
openSUSE Leap
php-composer2
How to mitigate CVE-2026-59946
Install security update from vendor's website.
composer - addressed in versions 2.2.29, 2.10.2
php-composer2 - update to 2.6.4-150600.3.12.1
php-composer2 - update to 2.6.4-150600.3.12.1