{"id":"CVE-2023-43655","aliases":["BIT-composer-2023-43655","GHSA-jm6m-4632-36hf"],"url":"https://o3.security/vulnerability/CVE-2023-43655","summary":"Remote Code Execution via web-accessible composer.phar","details":"Composer is a dependency manager for PHP. Users publishing a composer.phar to a public web-accessible server where the composer.phar can be executed as a php file may be subject to a remote code execution vulnerability if PHP also has `register_argc_argv` enabled in php.ini. Versions 2.6.4, 2.2.22 and 1.10.27 patch this vulnerability. Users are advised to upgrade. Users unable to upgrade should make sure `register_argc_argv` is disabled in php.ini, and avoid publishing composer.phar to the web as this is not best practice.","published":"2023-09-29T19:33:32.183Z","modified":"2026-08-12T03:51:44.069923485Z","cvss":{"score":6.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"composer/composer","fixedVersion":"1.10.27"},{"ecosystem":"Packagist","name":"composer/composer","fixedVersion":"2.2.22"},{"ecosystem":"Packagist","name":"composer/composer","fixedVersion":"2.6.4"}],"fix":{"url":"https://github.com/composer/composer/commit/4fce14795aba98e40b6c4f5047305aba17a6120d","label":"composer/composer@4fce147"},"references":[{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/03/msg00030.html"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/66H2WKFUO255T3BZTL72TNYJYH2XM5FG/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7AWYAUZNH565NWPIKGEIYBWHYNM5JGAE/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KFOPGPW2KS37O3KJWBRGTUWHTXCQXBS2/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/43xxx/CVE-2023-43655.json"},{"type":"ADVISORY","url":"https://github.com/composer/composer/security/advisories/GHSA-jm6m-4632-36hf"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-43655"},{"type":"FIX","url":"https://github.com/composer/composer/commit/4fce14795aba98e40b6c4f5047305aba17a6120d"},{"type":"FIX","url":"https://github.com/composer/composer/commit/955a48e6319c8962e5cd421b07c00ab3c728968c"},{"type":"FIX","url":"https://github.com/composer/composer/commit/95e091c921037b7b6564942845e7b738f6b95c9c"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:44.069923485Z"}}