CVE-2026-21636
CRITICAL 10.0EPSS 0.8%
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. * The issue affects users of the Node.js permission model on version v25. In the moment of this vulnerability, network permissions (`--allow-net`) are still in the experimental phase.
- CVSS v3.1
- 10.0 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H - CVSS v3.0
- 5.8 MEDIUM
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N - EPSS
- 0.83% chance of exploitation in the next 30 days, 55th percentile
- Published
- 2026-01-20
- Updated
- 2026-01-21
Proof-of-concept exploits (1)
- Pauldechassey/CVE-2026-216360★ · 2026-04-28