Composer: GHSA-gjfg-22fp-rrxx fix bypass via symlinked package bin path

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2026-59944: 0.47% estimated exploitation activity in the next 30 days; percentile 40.68 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary A malicious or compromised Composer package could, when installed as a dependency, cause Composer to change the permissions of a file outside that package's own directory and to register a runnable vendor/bin command that points at that outside file. This is a path traversal and link following issue. It is not remote code execution, the attacker gains no ability to read or receive your data directly. The risk is that a file which was readable only by its owner, but modifiable by Composer, can be made world readable and executable, which is enough to expose its contents on a shared or multi tenant host. The earlier hardening from GHSA-gjfg-22fp-rrxx can be bypassed, since it only rejected literal .. path segments in a package's declared binaries, and was only applied in a single place during dependency resolution. Am I affected? You can be affected if a malicious or compromised package, including a transitive dependency, is installed in your project, and either of the…

Published by the source

2 Oct 2026, 19:14 UTC

Last modified by the source

2 Oct 2026, 19:30 UTC

Source last checked

26 Oct 2026, 14:53 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-96h3-5x6v-m776

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-96h3-5x6v-m776

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# Patch Next advisory brief: CVE-2026-59944

Advisory: Composer: GHSA-gjfg-22fp-rrxx fix bypass via symlinked package bin path
IDs: CVE-2026-59944, GHSA-96h3-5x6v-m776
Record: https://patchnext.com/advisories/cve-2026-59944 (revision 2, source checked 26 Oct 2026, 14:53 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: composer/composer 2.10.3, 2.2.30. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist composer/composer: affected >= 2.3.0, < 2.10.3; >= 1.0, < 2.2.30; fixed in 2.10.3, 2.2.30

## Suggested inspection (read-only)
- Packagist composer/composer: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on composer/composer.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-96h3-5x6v-m776 (OSV record GHSA-96h3-5x6v-m776 lists affected ranges: Packagist composer/composer >=2.3.0 =1.0 =1.0.0-alpha1 =1.0.0-alpha10 =1.0.0-alpha11 =1.0.0-alpha2 =1.0.0-alpha3 =1.0.0-alpha4 =1.0.0-alpha5 =1.0.0-alpha6 =1.0.0-alpha7 =1.0.0-alpha8 =1.0.0-alpha9 =1.0.0-beta1…)
- Verified: https://github.com/advisories/GHSA-96h3-5x6v-m776 (GitHub-reviewed advisory GHSA-96h3-5x6v-m776 lists affected ranges: Packagist composer/composer >=2.3.0 =1.0 <2.2.30)

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