CVE search · CVE-2026-21636
CVE-2026-21636
critical 10.0
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.
Details
- Status
- Analyzed
- Published
- Last changed
- Source
- support@hackerone.com
- Weakness
- CWE-284
Severity
| Version | Score | Vector | Source |
|---|---|---|---|
| CVSS 3.1 | critical 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
nvd@nist.govPrimary |
| CVSS 3.0 | medium 5.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N |
support@hackerone.comSecondary |
Affected products
Vendor and product from the NVD’s CPE applicability statements. Versions and conditions are on the NVD’s page.
- nodejs · node.js
References
- https://nodejs.org/en/blog/vulnerability/december-2025-security-releasesRelease NotesVendor Advisory