Vulnerability Details CVE-2026-21636
A flaw in Node.js's permission model allows Unix Domain Socket (UDS) connections to bypass network restrictions when `--permission` is enabled. Even without `--allow-net`, attacker-controlled inputs (such as URLs or socketPath options) can connect to arbitrary local sockets via net, tls, or undici/fetch. This breaks the intended security boundary of the permission model and enables access to privileged local services, potentially leading to privilege escalation, data exposure, or local code execution.
* The issue affects users of the Node.js permission model on version v25.
In the moment of this vulnerability, network permissions (`--allow-net`) are still in the experimental phase.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.007
EPSS Ranking 50.1%
CVSS Severity
CVSS v3 Score 5.8
Products affected by CVE-2026-21636
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cpe:2.3:a:nodejs:node.js:25.0.0
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cpe:2.3:a:nodejs:node.js:25.1.0
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cpe:2.3:a:nodejs:node.js:25.2.0
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cpe:2.3:a:nodejs:node.js:25.2.1