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CVE-2026-21636
ANC
CriticalConfirmedExploit available

A flaw in Node.js's permission model allows Unix Domain Socket (UDS) connections to bypass network restrictions when `--permission` is enab…

CVSS
10.0
Critical
EPSS
0.00
p6
Published
2026-01-01
Updated
2026-01-01
Description

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.

Tags · CWE
Pre-auth
CWE-284
CAPEC-19
CAPEC-441
CAPEC-478
CAPEC-479
CAPEC-502
CAPEC-503
CAPEC-536
CAPEC-546
CAPEC-550
CAPEC-551
CAPEC-552
CAPEC-556
CAPEC-558
CAPEC-562
CAPEC-563
CAPEC-564
CAPEC-578
Affected products
Node.js 25.0.0–25.3.0
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Timeline
2026-01-01
Published
2026-01-01
Updated
CVSS 3.1 breakdown
Attack Vector
AV: N
Network (N)
Attack Complexity
AC: L
Low (L)
Privileges Required
PR: N
None (N)
User Interaction
UI: N
None (N)
Scope
S: C
Changed (C)
Confidentiality Impact
C: H
High (H)
Integrity Impact
I: H
High (H)
Availability Impact
A: H
High (H)
Exploit indicators
EPSS
0.000 · p6
Known exploited (KEV)
No
MITRE ATT&CK
Inferred via CAPEC
└ via CAPEC-552 · CWE-284
└ via CAPEC-19 · CWE-284
└ via CAPEC-564 · CWE-284
└ via CAPEC-562 · CWE-284
└ via CAPEC-558 · CWE-284
└ via CAPEC-552 · CWE-284
└ via CAPEC-550 · CWE-284
└ via CAPEC-564 · CWE-284
└ via CAPEC-478 · CWE-284
└ via CAPEC-564 · CWE-284
└ via CAPEC-556 · CWE-284
└ via CAPEC-558 · CWE-284
└ via CAPEC-19 · CWE-284
└ via CAPEC-564 · CWE-284
└ via CAPEC-552 · CWE-284
└ via CAPEC-479 · CWE-284
└ via CAPEC-578 · CWE-284
Known exploits — Сканер-ВС
CVE-2026-21636
github-poc · https://github.com/Pauldechassey/CVE-2026-21636
Enterprise
Affected software
ProductVendorStatus
Tracked
nodejsTracked
nodejsTracked
node.js*Tracked