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🚨 Security Advisory: 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.
A new vulnerability has been identified and published under CVE-2026-21711 as part of Microsoft’s Security Update Guide on Tue, 02 Jun 2026 01:47:37 -0700.
Organizations should review this advisory to understand potential risks, affected systems, and recommended mitigation steps. Timely awareness of vulnerabilities is critical for maintaining a strong cybersecurity posture and reducing exposure to emerging threats.
🔎 What this means for you:
This vulnerability may impact systems, applications, or services commonly used in enterprise environments. Security teams should evaluate exposure and apply updates or mitigations as soon as possible.
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.
🛡️ Recommended Actions
- Review the full advisory from Microsoft: View advisory
- Identify affected systems within your environment
- Apply patches or mitigations where applicable
- Monitor for suspicious activity related to this vulnerability
📡 Stay Ahead of Threats
This post is part of DataComm's vulnerability intelligence feed designed to keep your organization informed of the latest security risks.
For deeper insights, threat detection, and response capabilities, consider implementing a banking-grade security strategy that includes continuous monitoring, threat intelligence, and rapid incident response.
Our Status
DataComm is reviewing affected systems and validating compliance in accordance with vendor guidance. Customers requiring assistance are encouraged to contact our support team.
Support: support@datacomm.com
Phone: (877) 544-3655
Source: Microsoft Security Response Center (MSRC)
