EUVD-2026-42360Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
AV:L because Composer runs locally; PR:N because the attacker is the package author requiring no victim-system privileges; UI:R because the victim must actively invoke composer; C:H for potential exposure of sensitive files; I:L for chmod permission change without content modification.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Lifecycle Timeline
2DescriptionCVE.org
Composer is a dependency Manager for the PHP language. Prior to 2.2.29 and 2.10.2, a Composer package bin entry containing .. path segments can resolve outside the package install directory and cause Composer's binary installation flow to chmod an existing host file to a world-readable and world-executable mode during composer install, update, or require. This issue is fixed in versions 2.2.29 and 2.10.2.
AnalysisAI
Path traversal in Composer's binary installation flow allows a malicious PHP package to cause arbitrary host files to be chmod'd world-readable and world-executable. Any user running composer install, composer update, or composer require against a package whose bin entry contains .. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must run `composer install`, `composer update`, or `composer require` while installing or updating a package that contains a `bin` entry with `..` path traversal segments in its `composer.json`. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 3.1 vector (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N, score 6.1) accurately captures the threat model: local execution, low complexity, user interaction required (running Composer), high confidentiality impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A threat actor publishes a Composer package (or compromises an existing popular package) and includes a `bin` entry such as `../../../../../../home/ci/.ssh/id_rsa` in its `composer.json`. When a developer or CI/CD pipeline runs `composer require malicious/package` or `composer update`, Composer resolves the traversal path and executes chmod on the SSH private key, making it world-readable to all users on the system. … |
| Remediation | Upgrade to Composer 2.2.29 (LTS branch) or 2.10.2 (current branch) immediately - both releases are available at https://github.com/composer/composer/releases/tag/2.2.29 and https://github.com/composer/composer/releases/tag/2.10.2 respectively. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-22 – Path Traversal
View allSame technique Path Traversal
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External POC / Exploit Code
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