MEDIUM 5.3 Microsoft

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.

Microsoft Security Update 2026-Mar: 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

References

Published: 2026-03-10 · Source: Microsoft · Feed updated: 2026-08-10
This medium severity vulnerability with a CVSS score of 5.3 was published on 2026-03-10 via Microsoft. Affected: azl3 nodejs24 24.14.1-2 on Azure Linux 3.0, azl3 nodejs24 24.13.0-3 on Azure Linux 3.0, azl3 nodejs24 24.14.1-1 on Azure Linux 3.0 and 1 more.
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