{"id":"CVE-2026-59948","aliases":["BIT-composer-2026-59948","GHSA-499r-g7pc-vmp9"],"url":"https://o3.security/vulnerability/CVE-2026-59948","summary":"Composer: Arbitrary file write outside vendor via malicious transitive package name","details":"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.","published":"2026-07-08T19:33:48.414Z","modified":"2026-08-14T18:51:38.242598706Z","cvss":{"score":7,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"composer/composer","fixedVersion":"2.10.2"},{"ecosystem":"Packagist","name":"composer/composer","fixedVersion":"2.2.29"}],"fix":{"url":"https://github.com/composer/composer/commit/502c6c4f699802d9cf464728b3e8a95674f919a0","label":"composer/composer@502c6c4"},"references":[{"type":"WEB","url":"https://github.com/composer/composer/releases/tag/2.10.2"},{"type":"WEB","url":"https://github.com/composer/composer/releases/tag/2.2.29"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59948.json"},{"type":"ADVISORY","url":"https://github.com/composer/composer/security/advisories/GHSA-499r-g7pc-vmp9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-59948"},{"type":"FIX","url":"https://github.com/composer/composer/commit/502c6c4f699802d9cf464728b3e8a95674f919a0"},{"type":"FIX","url":"https://github.com/composer/composer/commit/c50b1efd13ebd73f6dca19b31424c5a02bf93cc1"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-14T18:51:38.242598706Z"}}