{"id":"CVE-2026-21636","details":"A flaw in Node.js's permission model allows Unix Domain Socket (UDS) connections to bypass network restrictions when `--permission` is enabled. Even without `--allow-net`, attacker-controlled inputs (such as URLs or socketPath options) can connect to arbitrary local sockets via net, tls, or undici/fetch. This breaks the intended security boundary of the permission model and enables access to privileged local services, potentially leading to privilege escalation, data exposure, or local code execution.\n\n* The issue affects users of the Node.js permission model on version v25.\n\nIn the moment of this vulnerability, network permissions (`--allow-net`) are still in the experimental phase.","aliases":["BIT-node-2026-21636","BIT-node-min-2026-21636"],"modified":"2026-08-12T03:30:23.293393619Z","published":"2026-01-20T20:41:55.700Z","database_specific":{"unresolved_ranges":[{"extracted_events":[{"introduced":"25.2.1"},{"last_affected":"25.2.1"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"hackerone","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21636.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21636.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21636"},{"type":"ARTICLE","url":"https://nodejs.org/en/blog/vulnerability/december-2025-security-releases"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/nodejs/node","events":[{"introduced":"0b3a10d4c8ba5e15429287e725d22615be896e95"},{"fixed":"00d6cd83927d6d5c8fe9d0cdd101daa6df4b1a15"}],"database_specific":{"extracted_events":[{"introduced":"25.0.0"},{"fixed":"25.3.0"}],"source":"CPE_RANGE","cpe":"cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*"}}],"versions":["v25.2.1","v25.2.0","v25.1.0","v25.0.0"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-21636.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N"}]}