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Node.js CVE-2026-21636

CRITICAL
Improper Access Control (CWE-284)
2026-01-20 support@hackerone.com
Privilege Escalation Node.js Red Hat Node.Js Suse
Critical
Disputed · 10.0 NVD
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Severity by source

Sources disagree (Medium–Critical)
NVD PRIMARY
10.0 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
SUSE
5.8 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
Red Hat
5.8 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Patch released
Apr 09, 2026 - 14:30 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Jan 20, 2026 - 21:16 nvd
CRITICAL 10.0

DescriptionCVE.org

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.

AnalysisAI

Node.js has a CVSS 10.0 permission model bypass that allows Unix Domain Socket connections to completely bypass network restrictions when --allow-net is configured.

Technical ContextAI

Node.js's permission model fails to restrict Unix Domain Socket (UDS) connections (CWE-284) when --allow-net is configured. Attackers can use UDS to communicate with any local service, bypassing the intended network restrictions entirely.

RemediationAI

Update Node.js. Restrict UDS access at the OS level. Don't rely solely on Node.js permissions for security boundaries.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise High Performance Computing 12 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Fixed
SUSE Linux Enterprise Server 15 SP7 Fixed
SUSE Linux Enterprise Server 16.0 Fixed

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CVE-2026-21636 vulnerability details – vuln.today
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