{"id":"CVE-2026-48159","summary":"use-reducer-async was vulnerable to malicious code execution via compromised commits","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.","aliases":["GHSA-2786-p4vj-vx8x"],"modified":"2026-10-08T02:51:03.525117523Z","published":"2026-08-10T17:55:45.932Z","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"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/dai-shi/use-reducer-async","events":[{"introduced":"da72edbde5705efcec6c62e0a3dcb73687b78dc8"},{"fixed":"df07d5711458d8b46e11dd7afaaa21e88cafabfb"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48159.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","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"}]}