Path traversal in composer - CVE-2026-59946

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

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.

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 High Performance Computing 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
Web and Scripting Module
openSUSE Leap
Anolis OS
php-composer2
composer
composer-doc

Install security update from vendor's website.

composer - addressed in versions 2.2.29, 2.10.2
php-composer2 - addressed in versions 2.2.30-150400.3.21.1, 2.2.30-150400.3.24.1, 2.6.4-150600.3.12.1
composer - update to 2.10.2-1
composer-doc - update to 2.10.2-1

• https://github.com/composer/composer/security/advisories/GHSA-gjfg-22fp-rrxx

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