CVE-2026-21711 — MEDIUM (5.3)

Vulnerability Description

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.

CVSS Score

5.3

MEDIUM

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

LOW

Integrity

LOW

Availability

LOW

Related Weaknesses (CWE)

CWE-284

References

https://nodejs.org/en/blog/vulnerability/march-2026-security-releases

FAQ

What is CVE-2026-21711?

CVE-2026-21711 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 th...

How severe is CVE-2026-21711?

CVE-2026-21711 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-21711?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.