GHSA-jm6m-4632-36hf · Severity: high · Ecosystem: composer — Composer Remote Code Execution vulnerability via web-accessible composer.phar
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.
Conclusion & alert: CVE-2023-43655 is rated Moderate Risk (54.2/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.53%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-09 | 1.57% | 1.53% | -0.04% |
| 2 | 2026-05-27 | 1.18% | 1.57% | +0.40% |
| 3 | 2026-05-24 | — | 1.18% | — |
Full EPSS history (37 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 6.4 | 3.1 | MEDIUM |
|
0.5 | 5.9 | [email protected] |
| 8.8 | 3.1 | HIGH |
|
2.8 | 5.9 | [email protected] |
GHSA-jm6m-4632-36hf · Severity: high · Ecosystem: composer — Composer Remote Code Execution vulnerability via web-accessible composer.phar
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2023-43655: 1 source package rows (composer); 12 state rows across 6 repos (3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 6, open 6. | https://security.alpinelinux.org/vuln/CVE-2023-43655 |
debian
|
not yet assigned | CVE-2023-43655 not yet assigned priority: Debian including 1 source packages (composer), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 4, open 1. | https://security-tracker.debian.org/tracker/CVE-2023-43655 |
gentoo
|
normal | CVE-2023-43655: 1 GLSA(s) (202508-06), 1 atom(s) (dev-php/composer); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2023-43655 |
suse
|
medium | CVE-2023-43655 severity moderate: SUSE including 4 source package names (latest:php-composer2-2.2.3-150400.3.6.1, php-composer2-2.2.3-150400.3.6.1, php-composer2-2.6.4-1.1, php-composer2-2.8.9-160000.2.2), 10 product×package rows across 10 product lines (Container bci/php, Container bci/php-apache, … (10 product lines)): Fixed 10. | https://www.suse.com/security/cve/CVE-2023-43655/ |
ubuntu
|
medium | CVE-2023-43655 medium priority: Ubuntu including 1 source packages (composer), 12 status rows across 12 suites (bionic, focal, jammy, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): released 5, not-affected 4, ignored 3. | https://ubuntu.com/security/CVE-2023-43655 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| getcomposer | composer | < 1.10.27 | cpe:2.3:a:getcomposer:composer:*:*:*:*:*:*:*:* |
| getcomposer | composer | >= 2.0.0, < 2.2.21 | cpe:2.3:a:getcomposer:composer:*:*:*:*:*:*:*:* |
| getcomposer | composer | >= 2.3.0, < 2.6.4 | cpe:2.3:a:getcomposer:composer:*:*:*:*:*:*:*:* |
| debian | debian_linux | 10.0 | cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* |
| fedoraproject | fedora | 37 | cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* |
| fedoraproject | fedora | 38 | cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:* |