CVE-2026-21711: Node.js

Medium severity, CVSS 5.3. EPSS: 0.2% chance of exploitation in the next 30 days.

A flaw in Node.js Permission Model network enforcement leaves Unix Domain Socket (UDS) server operations without the required permission checks, while all comparable network paths correctly enforce them. As a result, code running under `--permission` without `--allow-net` can create and expose local IPC endpoints, allowing communication with other processes on the same host outside of the intended network restriction boundary. This vulnerability affects Node.js **25.x** processes using the Permission Model where `--allow-net` is intentionally omitted to restrict network access. Note that `--allow-net` is currently an experimental feature.

Affected products

• Node.js Node.js: before 20.0.0 (fixed in 20.0.0); from 25.0.0, up to and including 25.8.1

Published 2026-03-30. Last modified 2026-08-19.