CVE-2026-59948
High
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.
SeverityHigh
CVSS7.0
Exploit probability—
ProductComposer/composer
PublishedJul 8, 2026
First seenJul 8, 2026
Weakness typeCWE-22Path traversalCWE-787Out-of-bounds write
How to fix
Update
- composer/composer2.10.2, 2.2.29 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| composer/composerPackagist | 2.3.0 ≤ v < 2.10.2, 1.0.0 ≤ v < 2.2.29 | 2.10.2, 2.2.29 |
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