Description
Composer is a dependency Manager for the PHP language. From 1.0 until 2.2.30 and 2.10.3, a malicious dependency package from a custom Composer repository or an untrusted composer.lock file could set source.type to perforce and source.url to an rsh: or jsh: P4PORT value. When the Perforce p4 client was installed and Composer installed the package from source through composer install or composer update, including --prefer-source, Composer\Util\Perforce passed the address to p4 without validation, causing p4 to run a local command with the privileges of the user or CI account. Packagist.org does not permit Perforce source metadata. This issue is fixed in versions 2.2.30 and 2.10.3.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| composer | composer | >= 1.0, < 2.2.30, >= 2.3.0, < 2.10.3 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | composer | 2.10.3-1 | — |
| Debian 13 | composer | No fix yet | — |
| Debian 12 | composer | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | composer | No fix yet | — |
| Ubuntu 26.04 LTS | composer | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | composer | No fix yet | — |
| Ubuntu Pro 22.04 LTS | composer | No fix yet | — |
| Ubuntu Pro 20.04 LTS | composer | No fix yet | — |
| Ubuntu Pro 18.04 LTS | composer | No fix yet | — |
| Ubuntu Pro 16.04 LTS | composer | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | composer | 2.10.3-1.hum1 | RHSA-2026:63151 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | php-composer2 | 2.6.4-150600.3.18.1 | SUSE-SU-2026:4059-1 |
| SLES 15 SP6 | php-composer2 | 2.6.4-150600.3.18.1 | SUSE-SU-2026:4059-1 |
| SLES 15 SP5 | php-composer2 | 2.2.30-150400.3.21.1 | SUSE-SU-2026:4283-1 |
| SLES 15 SP4 | php-composer2 | 2.2.30-150400.3.21.1 | SUSE-SU-2026:4283-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | php-composer2 | 2.8.9-160000.5.1 | SUSE-SU-2026:23635-1 |
| SLES for SAP 15 SP6 | php-composer2 | 2.6.4-150600.3.18.1 | SUSE-SU-2026:4059-1 |
| SLES for SAP 15 SP5 | php-composer2 | 2.2.30-150400.3.21.1 | SUSE-SU-2026:4283-1 |
| SLES for SAP 15 SP4 | php-composer2 | 2.2.30-150400.3.21.1 | SUSE-SU-2026:4283-1 |
| SLES 16.0 | php-composer2 | 2.8.9-160000.5.1 | SUSE-SU-2026:23635-1 |
| SLE HPC 15 SP5 | php-composer2 | 2.2.30-150400.3.21.1 | SUSE-SU-2026:4283-1 |
| SLE HPC 15 SP4 | php-composer2 | 2.2.30-150400.3.21.1 | SUSE-SU-2026:4283-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | php-composer2 | 2.10.3-2.1 | openSUSE-SU-2026:11689-1 |
| openSUSE Leap 16.0 | php-composer2 | 2.8.9-160000.5.1 | openSUSE-SU-2026:21778-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | composer | 2.10.3-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | composer | 2.10.3-1.amzn2023.0.1 | ALAS2023-2026-3136 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
-
Saku0512/CVE-2026-84361-poc ★ 0 · Sep 2, 2026
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Packagist | composer/composer | >= 2.3.0, < 2.10.3 | 2.10.3 | GHSA-rvx4-ffvw-m9q3 |
| Packagist | composer/composer | >= 1.0, < 2.2.30 | 2.2.30 | GHSA-rvx4-ffvw-m9q3 |
Advisories 8
- WID-SEC-2026-3072 Composer: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 1, 2026
- SUSE-SU-2026:23635-1 Security update for php-composer2 SUSE / openSUSE Security Updates · Sep 29, 2026
- ALAS2023-2026-3136 Important: composer security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Sep 28, 2026
- SUSE-SU-2026:4283-1 Security update for php-composer2 SUSE / openSUSE Security Updates · Sep 23, 2026
- RHSA-2026:63151 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Sep 22, 2026
- SUSE-SU-2026:4059-1 Security update for php-composer2 SUSE / openSUSE Security Updates · Sep 13, 2026
- openSUSE-SU-2026:21778-1 Security update for php-composer2 SUSE / openSUSE Security Updates · Sep 9, 2026
- openSUSE-SU-2026:11689-1 php-composer2-2.10.3-2.1 on GA media SUSE / openSUSE Security Updates · Sep 5, 2026
References
- https://github.com/composer/composer/security/advisories/GHSA-rvx4-ffvw-m9q3
- https://github.com/composer/composer/commit/0aac50528e83ed635cf788333635897469440220
- https://github.com/composer/composer/commit/199ad81a9cc6a2a5164ad79a8da26b2e19e521af
- https://github.com/composer/composer/releases/tag/2.10.3
- https://github.com/composer/composer/releases/tag/2.2.30