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Fencer Vulns
medium 5.8

CVE-2026-21636 json

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

published 2026-01-20 9 mo ago modified 2026-09-08 2 mo ago also BIT-node-2026-21636 , BIT-node-min-2026-21636 , EUVD-2026-3334

cvss
5.8
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 59%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami node 25.3.0
  • bitnami node-min 25.3.0
  • nodejs node.js 25.3.0
  • nodejs20 hummingbird 1 20.20.0-7.1.hum1
  • nodejs20-bin hummingbird 1 20.20.0-7.1.hum1
  • nodejs20-npm hummingbird 1 10.8.2-1.20.20.0.7.1.hum1
  • nodejs20-libs hummingbird 1 20.20.0-7.1.hum1
  • nodejs20-npm-bin hummingbird 1 20.20.0-7.1.hum1
  • nodejs20-full-i18n hummingbird 1 20.20.0-7.1.hum1
  • nodejs22 hummingbird 1 22.22.0-1.3.hum1
  • nodejs22-bin hummingbird 1 22.22.0-1.3.hum1

red hat advisories RHSA-2026:7386RHSA-2026:7387RHSA-2026:6431RHSA-2026:6402

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-21636 updated cvss 5.8

nodejs: Nodejs network segmentation bypass

  • Red Hat Hardened Images nodejs25 25.9.0-1.hum1, nodejs24 24.14.1-4.hum1, nodejs20 20.20.0-7.1.hum1, nodejs22 22.22.0-1.3.hum1, nodejs25-bin 25.9.0-1.hum1, nodejs24-bin 24.14.1-4.hum1, +18 more
    fixed: vendor fix RHSA-2026:7386
  • Red Hat Enterprise Linux 8 npm, nodejs, nodejs-libs, nodejs-nodemon, nodejs-full-i18n, nodejs-packaging, +1 more Red Hat Enterprise Linux 9 npm, nodejs, nodejs-libs, nodejs-full-i18n Red Hat Enterprise Linux 10 nodejs22, nodejs24 Red Hat Hardened Images v8-14.1-devel 14.1.146.11-1.25.9.0.1.hum1, v8-13.6-devel 13.6.233.17-1.24.14.1.4.hum1, v8-11.3-devel 11.3.244.8-1.20.20.0.7.1.hum1, v8-12.4-devel 12.4.254.21-1.22.22.0.1.3.hum1
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
9 mo ago

Exploit prediction

0.87% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 5.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
NVD 3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
OSV 3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
bitnami node
>=25.0.0, <25.3.0
25.3.0
bitnami node-min
>=25.0.0, <25.3.0
25.3.0

Affected products

  • nodejs node

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.