Vulnerability-Lookup

CVE-2026-59944 (GCVE-0-2026-59944)

Vulnerability from cvelistv5 – Published: 2026-09-16 16:09 – Updated: 2026-09-16 17:29

Title

Composer: CVE-2026-59946 fix bypass via symlinked package bin path

Summary

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.

Severity

6.1 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-16 17:29 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 8026 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/composer/composer/security/adv…	x_refsource_CONFIRM
https://github.com/composer/composer/commit/53b8b…	x_refsource_MISC
https://github.com/composer/composer/commit/ad649…	x_refsource_MISC
https://github.com/composer/composer/releases/tag…	x_refsource_MISC
https://github.com/composer/composer/releases/tag…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
composer	composer	Affected: >= 1.0.0, < 2.2.30 Affected: >= 2.3.0, < 2.10.3	guessed

Show details on NVD website

JSON

To clipboard

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}

bit-composer-2026-59944

Vulnerability from bitnami_vulndb

Published

2026-09-25 12:20

Modified

2026-10-06 12:12

Summary

Composer: CVE-2026-59946 fix bypass via symlinked package bin path

Details

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "composer",
        "purl": "pkg:bitnami/composer"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.0.0"
            },
            {
              "fixed": "2.2.30"
            },
            {
              "introduced": "2.3.0"
            },
            {
              "fixed": "2.10.3"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-59944"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:getcomposer:composer:*:*:*:*:*:*:*:*",
      "cpe:2.3:a:getcomposer:composer:*:*:*:*:*:php:*:*"
    ],
    "severity": "Medium"
  },
  "details": "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\u0027s 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.",
  "id": "BIT-composer-2026-59944",
  "modified": "2026-10-06T12:12:21.709Z",
  "published": "2026-09-25T12:20:02.481Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/composer/composer/commit/53b8bb4c24697b2f00a18cf1ef35a10392701b89"
    },
    {
      "type": "WEB",
      "url": "https://github.com/composer/composer/commit/ad649fdfdf8ed826d4a34e0e5690c76a0b4833aa"
    },
    {
      "type": "WEB",
      "url": "https://github.com/composer/composer/releases/tag/2.10.3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/composer/composer/releases/tag/2.2.30"
    },
    {
      "type": "WEB",
      "url": "https://github.com/composer/composer/security/advisories/GHSA-96h3-5x6v-m776"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-59944"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Composer: CVE-2026-59946 fix bypass via symlinked package bin path"
}

FKIE_CVE-2026-59944

Vulnerability from fkie_nvd - Published: 2026-09-16 17:17 - Updated: 2026-09-30 17:43

Severity

6.1 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/composer/composer/commit/53b8bb4c24697b2f00a18cf1ef35a10392701b89
	security-advisories@github.com	https://github.com/composer/composer/commit/ad649fdfdf8ed826d4a34e0e5690c76a0b4833aa
	security-advisories@github.com	https://github.com/composer/composer/releases/tag/2.10.3
	security-advisories@github.com	https://github.com/composer/composer/releases/tag/2.2.30
	security-advisories@github.com	https://github.com/composer/composer/security/advisories/GHSA-96h3-5x6v-m776

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "composer",
          "vendor": "composer",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.0.0, \u003c 2.2.30"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.3.0, \u003c 2.10.3"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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\u0027s 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."
    }
  ],
  "id": "CVE-2026-59944",
  "lastModified": "2026-09-30T17:43:24.057",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 4.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-59944",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-16T17:29:17.703299Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-16T17:17:28.590",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/composer/composer/commit/53b8bb4c24697b2f00a18cf1ef35a10392701b89"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/composer/composer/commit/ad649fdfdf8ed826d4a34e0e5690c76a0b4833aa"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/composer/composer/releases/tag/2.10.3"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/composer/composer/releases/tag/2.2.30"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/composer/composer/security/advisories/GHSA-96h3-5x6v-m776"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        },
        {
          "lang": "en",
          "value": "CWE-59"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-96H3-5X6V-M776

Vulnerability from github – Published: 2026-10-02 19:14 – Updated: 2026-10-02 19:14

Summary

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

Details

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 following is true:

The dependency package ships one of its declared binaries as a symbolic link that resolves to a location outside the package's own directory. Nothing beyond a normal install or update is required.
Or, the recorded metadata of your installed dependencies (vendor/composer/installed.json) declares a binary path that escapes the package's directory. Composer regenerates missing binaries from that recorded metadata at the end of an install, and uses this metadata for reinstalls of the same package. In both of these cases the validation applied during dependency resolution is skipped. This situation is only reachable when your vendor directory is not populated from the same install run, which performs validation. For example a vendor directory restored from a shared or untrusted CI cache, copied in from an earlier container build stage, carried over from a Composer older than 2.10.2 or 2.2.29, or writable by a lower trust build step, could contain such malicious data.

The most realistic way to get hit is a composer install in a build or deploy step that reuses a vendor directory produced elsewhere, since the permission change is applied silently and with the privileges of the user running Composer.

Patched versions

Composer now verifies that each declared binary resolves to a path inside the installing package's own directory before it touches the file, and skips any binary that resolves outside it with a warning. Update to the patched releases (2.10.3 and 2.2.30).

Workarounds

Upgrading is the only complete fix.

Severity

6.1 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "composer/composer"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.3.0"
            },
            {
              "fixed": "2.10.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "composer/composer"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.0"
            },
            {
              "fixed": "2.2.30"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-59944"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22",
      "CWE-59",
      "CWE-732"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-02T19:14:34Z",
    "nvd_published_at": "2026-09-16T17:17:28Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nA malicious or compromised Composer package could, when installed as a dependency, cause Composer to change the permissions of a file outside that package\u0027s 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\u0027s declared binaries, and was only applied in a single place during dependency resolution.\n\n## Am I affected?\n\nYou can be affected if a malicious or compromised package, including a transitive dependency, is installed in your project, and either of the following is true:\n\n- The dependency package ships one of its declared binaries as a symbolic link that resolves to a location outside the package\u0027s own directory. Nothing beyond a normal install or update is required.\n- Or, the recorded metadata of your installed dependencies (`vendor/composer/installed.json`) declares a binary path that escapes the package\u0027s directory. Composer regenerates missing binaries from that recorded metadata at the end of an install, and uses this metadata for reinstalls of the same package. In both of these cases the validation applied during dependency resolution is skipped. This situation is only reachable when your `vendor` directory is not populated from the same install run, which performs validation. For example a vendor directory restored from a shared or untrusted CI cache, copied in from an earlier container build stage, carried over from a Composer older than 2.10.2 or 2.2.29, or writable by a lower trust build step, could contain such malicious data.\n\nThe most realistic way to get hit is a `composer install` in a build or deploy step that reuses a `vendor` directory produced elsewhere, since the permission change is applied silently and with the privileges of the user running Composer.\n\n## Patched versions\n\nComposer now verifies that each declared binary resolves to a path inside the installing package\u0027s own directory before it touches the file, and skips any binary that resolves outside it with a warning. Update to the patched releases (2.10.3 and 2.2.30).\n\n## Workarounds\n\nUpgrading is the only complete fix.",
  "id": "GHSA-96h3-5x6v-m776",
  "modified": "2026-10-02T19:14:34Z",
  "published": "2026-10-02T19:14:34Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/composer/composer/security/advisories/GHSA-96h3-5x6v-m776"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-59944"
    },
    {
      "type": "WEB",
      "url": "https://github.com/composer/composer/commit/53b8bb4c24697b2f00a18cf1ef35a10392701b89"
    },
    {
      "type": "WEB",
      "url": "https://github.com/composer/composer/commit/ad649fdfdf8ed826d4a34e0e5690c76a0b4833aa"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/composer/composer"
    },
    {
      "type": "WEB",
      "url": "https://github.com/composer/composer/releases/tag/2.10.3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/composer/composer/releases/tag/2.2.30"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Composer: GHSA-gjfg-22fp-rrxx fix bypass via symlinked package bin path"
}

OPENSUSE-SU-2026:11633-1

Vulnerability from csaf_opensuse - Published: 2026-08-28 00:00 - Updated: 2026-09-17 17:21

Summary

php-composer2-2.10.3-1.1 on GA media

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2026-59944.

CVE-2026-59944

6.1 (Medium)


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

Recommended: 4 products

Open the full advisory

OPENSUSE-SU-2026:21970-1

Vulnerability from csaf_opensuse - Published: 2026-09-29 14:57 - Updated: 2026-10-01 16:39

Summary

Security update for php-composer2

Severity

Moderate

Scope

3 vulnerabilities in this advisory, including CVE-2026-59944.

CVE-2026-59944

6.1 (Medium)


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

Recommended: 1 product

Open the full advisory

RHSA-2026:63151

Vulnerability from csaf_redhat - Published: 2026-09-03 11:17 - Updated: 2026-10-31 07:46

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Severity

Important

Scope

2 vulnerabilities in this advisory, including CVE-2026-59944.

CVE-2026-59944

A flaw was found in Composer, a dependency manager for PHP. A malicious or compromised dependency can bypass existing security measures designed to prevent unauthorized binary path execution. This can occur when Composer processes untrusted cached data or older build artifacts, allowing it to follow symlinked paths outside of its intended installation directory. As a result, Composer may change the permissions of external files to make them executable and create proxy entries, potentially leading to the execution of unauthorized binaries.

5.0 (Medium)


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

Fixed: 3 products

https://access.redhat.com/errata/RHSA-2026:63151

Open the full advisory

SUSE-SU-2026:23943-1

Vulnerability from csaf_suse - Published: 2026-09-29 14:45 - Updated: 2026-10-02 10:44

Summary

Security update for php-composer2

Severity

Moderate

Scope

3 vulnerabilities in this advisory, including CVE-2026-59944.

CVE-2026-59944

6.1 (Medium)


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

Recommended: 2 products

Open the full advisory

UBUNTU-CVE-2026-59944 (CVE-2026-59944)

Vulnerability from osv_ubuntu – Published: 2026-09-16 17:17 – Updated: 2026-10-17 09:45 – Source website

Details

Severity

6.1 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-59944	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-59944	REPORT
	https://github.com/composer/composer/security/adv…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "composer",
            "binary_version": "1.0.0~beta2-1ubuntu0.1~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "composer",
        "purl": "pkg:deb/ubuntu/composer@1.0.0~beta2-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.0~alpha10+20150602-1",
        "1.0.0~alpha10+20150602-2",
        "1.0.0~alpha11-1",
        "1.0.0~alpha11-1ubuntu1",
        "1.0.0~alpha11-2",
        "1.0.0~alpha11-3",
        "1.0.0~beta1-1ubuntu1",
        "1.0.0~beta2-1",
        "1.0.0~beta2-1ubuntu0.1~esm1",
        "1.0.0~beta2-1ubuntu0.1~esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "composer",
            "binary_version": "1.6.3-1ubuntu0.1~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "composer",
        "purl": "pkg:deb/ubuntu/composer@1.6.3-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.1-1",
        "1.5.2-1",
        "1.6.2-1",
        "1.6.3-1",
        "1.6.3-1ubuntu0.1~esm1",
        "1.6.3-1ubuntu0.1~esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "composer",
            "binary_version": "1.10.1-1ubuntu0.1~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "composer",
        "purl": "pkg:deb/ubuntu/composer@1.10.1-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.9.0-2",
        "1.9.1-1",
        "1.9.2-1",
        "1.9.3-1",
        "1.10.0-1",
        "1.10.1-1",
        "1.10.1-1ubuntu0.1~esm1",
        "1.10.1-1ubuntu0.1~esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "composer",
            "binary_version": "2.2.6-2ubuntu4+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "composer",
        "purl": "pkg:deb/ubuntu/composer@2.2.6-2ubuntu4+esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.9-2ubuntu2",
        "2.0.9-2ubuntu3",
        "2.0.13-1ubuntu1",
        "2.1.12-1ubuntu1",
        "2.2.6-2ubuntu4",
        "2.2.6-2ubuntu4+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "composer",
            "binary_version": "2.7.1-2ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "composer",
        "purl": "pkg:deb/ubuntu/composer@2.7.1-2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.5.8-1",
        "2.6.5-1",
        "2.6.6-1",
        "2.7.1-2",
        "2.7.1-2ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "composer",
            "binary_version": "2.10.2-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "composer",
        "purl": "pkg:deb/ubuntu/composer@2.10.2-1?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.9.5-1",
        "2.10.1-2",
        "2.10.2-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "composer",
            "binary_version": "2.9.5-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "composer",
        "purl": "pkg:deb/ubuntu/composer@2.9.5-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.8.8-1",
        "2.9.5-1"
      ]
    }
  ],
  "aliases": [],
  "details": "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\u0027s 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.",
  "id": "UBUNTU-CVE-2026-59944",
  "modified": "2026-10-17T09:45:59Z",
  "published": "2026-09-16T17:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-59944"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-59944"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/composer/composer/security/advisories/GHSA-96h3-5x6v-m776"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-59944"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-59944 (GCVE-0-2026-59944)

bit-composer-2026-59944

Vulnerability from bitnami_vulndb

FKIE_CVE-2026-59944

GHSA-96H3-5X6V-M776

Summary

Am I affected?

Patched versions

Workarounds

OPENSUSE-SU-2026:11633-1

OPENSUSE-SU-2026:21970-1

RHSA-2026:63151

SUSE-SU-2026:23943-1

UBUNTU-CVE-2026-59944 (CVE-2026-59944)

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour