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Vulnerability record · CVE-2023-43655 · published 29 September 2023

CVE-2023-43655: Getcomposer composer injection vulnerability

Getcomposer · Composer

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.

8.8 CVSS 3.1 High EPSS 1.4% · top 28.8% CWE-74 · Injection
8.8CVSS 3.1 base score
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
16References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/composer/composer/commit/4fce14795aba98e40b6c4f5047305aba17a6120d Patch
https://github.com/composer/composer/commit/955a48e6319c8962e5cd421b07c00ab3c728968c Patch
https://github.com/composer/composer/commit/95e091c921037b7b6564942845e7b738f6b95c9c Patch
https://github.com/composer/composer/security/advisories/GHSA-jm6m-4632-36hf Vendor Advisory
https://lists.debian.org/debian-lts-announce/2024/03/msg00030.html Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/66H2WKFUO255T3BZTL72TNYJY Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/7AWYAUZNH565NWPIKGEIYBWHY Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/KFOPGPW2KS37O3KJWBRGTUWHT Mailing ListThird Party Advisory
https://github.com/composer/composer/commit/4fce14795aba98e40b6c4f5047305aba17a6120d Patch
https://github.com/composer/composer/commit/955a48e6319c8962e5cd421b07c00ab3c728968c Patch
https://github.com/composer/composer/commit/95e091c921037b7b6564942845e7b738f6b95c9c Patch
https://github.com/composer/composer/security/advisories/GHSA-jm6m-4632-36hf Vendor Advisory
https://lists.debian.org/debian-lts-announce/2024/03/msg00030.html Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/66H2WKFUO255T3BZTL72TNYJY Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/7AWYAUZNH565NWPIKGEIYBWHY Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/KFOPGPW2KS37O3KJWBRGTUWHT Mailing ListThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2023-43655), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.