Composer: Arbitrary file write outside vendor via malicious transitive package name

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Summary

CVECVE-2026-59948
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-08 20:16:59 UTC
Updated2026-07-08 20:16:59 UTC
DescriptionComposer is a dependency Manager for the PHP language. Prior to 2.2.29 and 2.10.2, a maliciously crafted package from an untrusted repository other than Packagist.org or Private Packagist can cause Composer to write attacker-controlled files outside the vendor directory and outside the project during install or update by using an invalid package name that is not correctly validated before dependency-resolution results are written or installed. This issue is fixed in versions 2.2.29 and 2.10.2.

Risk And Classification

Primary CVSS: v3.1 7 HIGH from [email protected]

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

Problem Types: CWE-22 | CWE-787 | CWE-22 CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | CWE-787 CWE-787: Out-of-bounds Write

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7HIGHCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNADECLARED7HIGHCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Composer Composer affected >= 1.0, < 2.2.29 Not specified
CNA Composer Composer affected >= 2.3.0, < 2.10.2 Not specified

References

ReferenceSourceLinkTags
github.com/composer/composer/commit/502c6c4f699802d9cf464728b3e8a95674f9... [email protected] github.com
github.com/composer/composer/security/advisories/GHSA-499r-g7pc-vmp9 [email protected] github.com
github.com/composer/composer/commit/c50b1efd13ebd73f6dca19b31424c5a02bf9... [email protected] github.com
github.com/composer/composer/releases/tag/2.10.2 [email protected] github.com
github.com/composer/composer/releases/tag/2.2.29 [email protected] github.com
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