{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.0"
              },
              {
                "fixed": "2.2.29"
              },
              {
                "introduced": "2.3.0"
              },
              {
                "fixed": "2.10.2"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "32df3aa8cdbdaa16df9491b5e672e81c87f94c78"
            },
            {
              "introduced": "934ee6eed3c3ffd0aeccef7c1d255adcf0752b24"
            },
            {
              "fixed": "ccbe57917efe30262ce80463fc4a6182c5ac29ed"
            },
            {
              "fixed": "8d4439f572a97670a9edc039eb3b093cc976b4bc"
            },
            {
              "fixed": "502c6c4f699802d9cf464728b3e8a95674f919a0"
            },
            {
              "fixed": "c50b1efd13ebd73f6dca19b31424c5a02bf93cc1"
            }
          ],
          "repo": "https://github.com/composer/composer",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-499r-g7pc-vmp9"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-22",
      "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59948.json"
  },
  "details": "Composer 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.",
  "id": "CVE-2026-59948",
  "modified": "2026-08-07T11:30:59.415435148Z",
  "published": "2026-07-08T19:33:48.414Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/composer/composer/releases/tag/2.10.2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/composer/composer/releases/tag/2.2.29"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59948.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/composer/composer/security/advisories/GHSA-499r-g7pc-vmp9"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-59948"
    },
    {
      "type": "FIX",
      "url": "https://github.com/composer/composer/commit/502c6c4f699802d9cf464728b3e8a95674f919a0"
    },
    {
      "type": "FIX",
      "url": "https://github.com/composer/composer/commit/c50b1efd13ebd73f6dca19b31424c5a02bf93cc1"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Composer: Arbitrary file write outside vendor via malicious transitive package name"
}