PT-2026-56551 · Composer · Composer

Published 2026-07-08 · Updated 2026-07-08 · CVE-2026-59948

NVD

CVSS v3.1

7.0

High

Base vector

AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Composer is a dependency Manager for the PHP language. Prior to 2.2.29 and 2.10.2, a maliciously crafted package from an untrusted repository other than Packagist.org or Private Packagist can cause Composer to write attacker-controlled files outside the vendor directory and outside the project during install or update by using an invalid package name that is not correctly validated before dependency-resolution results are written or installed. This issue is fixed in versions 2.2.29 and 2.10.2.

Fix

Memory Corruption

Path traversal

Weakness Enumeration

CWE-787

CWE-22

Related Identifiers

CVE-2026-59948

Affected Products

Composer

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-59948 · Security Note
• https://github.com/composer/composer/security/advisories/GHSA-499r-g7pc-vmp9 · Note
• https://github.com/composer/composer/commit/502c6c4f699802d9cf464728b3e8a95674f919a0 · Note
• https://github.com/composer/composer/releases/tag/2.10.2 · Note
• https://github.com/composer/composer/commit/c50b1efd13ebd73f6dca19b31424c5a02bf93cc1 · Note
• https://github.com/composer/composer/releases/tag/2.2.29 · Note