CVE-2026-59944

Composer is a dependency Manager for the PHP language. From 1.0 until 2.2.30 and from 2.3.0 until 2.10.3, a malicious or compromised dependency can bypass the earlier CVE-2026-59946 binary-path hardening because Composer validates literal parent-directory segments only during dependency resolution, while the symlink and installed-metadata paths described by the advisory skip that validation. A package can ship an in-package binary symlink that resolves outside its installation directory, or attacker-influenced vendor/composer/installed.json metadata can provide an escaping binary path during a reinstall or regeneration of missing vendor/bin entries. The installed-metadata path is reachable only when the vendor directory was not populated by the same validated install run, such as when it is restored from an untrusted cache, copied from an earlier build stage, carried over from an older Composer run, or writable by a lower-trust build step. Composer can follow the path, change the external target's permissions to make it world-readable and executable, and create a runnable vendor/bin proxy to that external file. The issue does not directly read or transmit data and does not by itself provide remote code execution. This issue is fixed in versions 2.2.30 and 2.10.3.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-22",
        "CWE-59"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59944.json"
}

References

Affected packages

Git / github.com/composer/composer

Affected ranges

Type

GIT

Repo

https://github.com/composer/composer

Events

Introduced

32df3aa8cdbdaa16df9491b5e672e81c87f94c78

Fixed

dcf399dbf5a5d05b54169fe2caf018152edba181

Introduced

934ee6eed3c3ffd0aeccef7c1d255adcf0752b24

Fixed

f0de0bf90226853b841672f086d8b58b02332504

Database specific

Show details

{
    "extracted_events": [
        {
            "introduced": "1.0.0"
        },
        {
            "fixed": "2.2.30"
        },
        {
            "introduced": "2.3.0"
        },
        {
            "fixed": "2.10.3"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

2.*

2.10.0

2.10.0-RC1

2.10.0-RC2

2.10.1

2.10.2

2.3.0

2.3.1

2.3.2

2.3.3

2.3.4

2.3.5

2.4.0

2.4.0-RC1

2.4.1

2.5.0

2.5.1

2.5.2

2.6.0

2.6.1

2.6.2

2.6.3

2.6.4

2.6.5

2.7.0

2.7.1

2.7.2

2.7.3

2.7.4

2.7.5

2.7.6

2.7.7

2.7.8

2.7.9

2.8.0

2.8.1

2.8.2

2.8.3

2.8.4

2.8.5

2.8.6

2.8.7

2.8.8

2.8.9

2.9.0

2.9.0-RC1

2.9.1

2.9.2

2.9.3

2.9.4

2.9.5

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59944.json"