Medium 6.1Published Jul 8, 2026

CVE-2026-59946Composer: Path traversal in package bin field lets dependencies chmod arbitrary host files

Updated under an hour ago (Oct 27, 2026, 9:20 AM ET)

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Exploited in the last 30 days

Composer is a dependency Manager for the PHP language. Prior to 2.2.29 and 2.10.2, a Composer package bin entry containing .. path segments can resolve outside the package install directory and cause Composer's binary installation flow to chmod an existing host file to a world-readable and world-executable mode during composer install, update, or require. This issue is fixed in versions 2.2.29 and 2.10.2.

CVSS: 6.1 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Weakness (CWE): CWE-22, CWE-732
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Jul 9, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

composer composer composer:composer (from the name)	from 1.0, < 2.2.29; from 2.3.0, < 2.10.2	CNA record

References

References

https://github.com/composer/composer/security/advisories/GHSA-gjfg-22fp-rrxx	x-refsource-confirm
https://github.com/composer/composer/commit/502c6c4f699802d9cf464728b3e8a95674f919a0	x-refsource-misc
https://github.com/composer/composer/commit/c50b1efd13ebd73f6dca19b31424c5a02bf93cc1	x-refsource-misc
https://github.com/composer/composer/releases/tag/2.10.2	x-refsource-misc
https://github.com/composer/composer/releases/tag/2.2.29	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.