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Vulnerability record · CVE-2026-59948 · published 8 July 2026

CVE-2026-59948: Path traversal vulnerability

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.

7.0 CVSS 3.1 High EPSS 0.16% · top 95.0% CWE-22 · Path traversalCWE-787 · Out-of-bounds write Deferred
7.0CVSS 3.1 base score
0.16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
10 Jul 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References

LinkTags
https://github.com/composer/composer/commit/502c6c4f699802d9cf464728b3e8a95674f919a0
https://github.com/composer/composer/commit/c50b1efd13ebd73f6dca19b31424c5a02bf93cc1
https://github.com/composer/composer/releases/tag/2.10.2
https://github.com/composer/composer/releases/tag/2.2.29
https://github.com/composer/composer/security/advisories/GHSA-499r-g7pc-vmp9

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Source: NIST National Vulnerability Database (record CVE-2026-59948), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.