Vulnerability in Node.js Node
CVE-2026-21711
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.002 (6.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 6.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Node.js Node — versions 25.8.1, 4.0, 5.0
- Node.js
Weakness classification (CWE)
References
- nodejs.org/en/blog/vulnerability/march-2026-security-releases (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-21711?
- CVE-2026-21711 is a medium-severity vulnerability in Node.js Node, classified under Improper Access Control. CVSS score: 5.3/10. Published 2026-03-30.
- How severe is CVE-2026-21711?
- Medium severity. CVSS v3 base score is 5.3 out of 10.