{"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":"2026-03-09T23:57:23.125415Z","published":"2026-01-20T21:16:05.813Z","related":["CGA-wjpj-6vhc-26v9"],"references":[{"type":"ADVISORY","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":{"versions":[{"introduced":"25.0.0"},{"fixed":"25.3.0"}]}}],"versions":["v25.0.0","v25.1.0","v25.2.0","v25.2.1"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-21636.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"}]}