Composer: Path traversal in package bin field lets dependencies chmod arbitrary host files
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.
01
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-59946US | — | — | ||
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… | ||||
02
references
External citations — patches, advisories, analysis.
- https://github.com/composer/composer/commit/502c6c4f699802d9cf464728b3e8a95674f919a0WEB
- https://github.com/composer/composer/commit/c50b1efd13ebd73f6dca19b31424c5a02bf93cc1WEB
- https://github.com/composer/composer/releases/tag/2.10.2WEB
- https://github.com/composer/composer/releases/tag/2.2.29WEB
- https://github.com/composer/composer/security/advisories/GHSA-gjfg-22fp-rrxxWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-59946WEB
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