CVE-2023-43655

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.

• CWE-74
• CWE-74

• https://github.com/composer/composer/commit/4fce14795aba98e40b6c4f5047305aba17a6120dPatch
• https://github.com/composer/composer/commit/955a48e6319c8962e5cd421b07c00ab3c728968cPatch
• https://github.com/composer/composer/commit/95e091c921037b7b6564942845e7b738f6b95c9cPatch
• https://github.com/composer/composer/security/advisories/GHSA-jm6m-4632-36hfVendor Advisory
• https://lists.debian.org/debian-lts-announce/2024/03/msg00030.htmlMailing List
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/66H2WKFUO255T3BZTL72TNYJYH2XM5FG/Mailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7AWYAUZNH565NWPIKGEIYBWHYNM5JGAE/Mailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KFOPGPW2KS37O3KJWBRGTUWHTXCQXBS2/Mailing List, Third Party Advisory
• https://github.com/composer/composer/commit/4fce14795aba98e40b6c4f5047305aba17a6120dPatch
• https://github.com/composer/composer/commit/955a48e6319c8962e5cd421b07c00ab3c728968cPatch
• https://github.com/composer/composer/commit/95e091c921037b7b6564942845e7b738f6b95c9cPatch
• https://github.com/composer/composer/security/advisories/GHSA-jm6m-4632-36hfVendor Advisory
• https://lists.debian.org/debian-lts-announce/2024/03/msg00030.htmlMailing List
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/66H2WKFUO255T3BZTL72TNYJYH2XM5FG/Mailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7AWYAUZNH565NWPIKGEIYBWHYNM5JGAE/Mailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KFOPGPW2KS37O3KJWBRGTUWHTXCQXBS2/Mailing List, Third Party Advisory

Published

Sep 29, 2023

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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