{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "da72edbde5705efcec6c62e0a3dcb73687b78dc8"
            },
            {
              "fixed": "df07d5711458d8b46e11dd7afaaa21e88cafabfb"
            }
          ],
          "repo": "https://github.com/dai-shi/use-reducer-async",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-2786-p4vj-vx8x"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-506"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48159.json"
  },
  "details": "use-reducer-async is a React useReducer with async actions. Between 2026-05-18 16:29:52 and 2026-05-19 15:26:07, the default branch contained malicious commits da72edbde5705efcec6c62e0a3dcb73687b78dc8 through df07d5711458d8b46e11dd7afaaa21e88cafabfb that executed remote attacker-controlled code on developer machines during `npm install`. The commits were removed by force-push, but local clones, forks, and direct-SHA URLs may still contain them, and `npm install` against an affected checkout will still execute the code today. The package was not published to npm. `src/install.js` was added and wired into the `postinstall` script. It fetched a JavaScript payload from an attacker-controlled HTTPS endpoint (configurable via an environment variable), disabled TLS verification, and evaluated the response as code with `require` available. Execution was deliberately skipped on CI and cloud/serverless environments, targeting developer workstations. The second-stage payload was attacker-hosted and cannot be reconstructed. Assume full compromise of anything reachable from a Node process with the user's permissions. Those who ran `npm install` against an affected checkout on a developer machine on or after 2026-05-18 16:29:52 should treat the machine as compromised, rotate every credential the machine could reach, audit account activity since 2026-05-18 16:29:52, and clean local clones.",
  "id": "CVE-2026-48159",
  "modified": "2026-10-08T02:31:07.737623955Z",
  "published": "2026-08-10T17:55:45.932Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48159.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/dai-shi/use-reducer-async/security/advisories/GHSA-2786-p4vj-vx8x"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48159"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "use-reducer-async was vulnerable to malicious code execution via compromised commits"
}