CVE-2026-59948
Composer: Arbitrary file write outside vendor via malicious transitive package name
- State
- Published
- Severity
- 7.0 High
- Published
- Jul 8, 2026
- Updated
- Jul 9, 2026
- Reserved
- Jul 7, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.0 High | CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H | GitHub_M |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
composercomposer |
|
References
- https://github.com/composer/composer/security/advisories/GHSA-499r-g7pc-vmp9
- 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
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