UBUNTU-CVE-2026-21636

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Source
https://ubuntu.com/security/CVE-2026-21636
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-21636.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-21636
Upstream
Published
2026-01-20T21:16:00Z
Modified
2026-11-04T20:03:15Z
Severity
  • 5.8 (Medium) CVSS_V3 - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N CVSS Calculator
  • 10.0 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:25.10 / nodejs

Package

Name
nodejs
Purl
pkg:deb/ubuntu/nodejs?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

20.*
20.18.1+dfsg-1ubuntu2
20.19.2+dfsg-1
20.19.4+dfsg-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libnode115",
            "binary_version": "20.19.4+dfsg-1"
        },
        {
            "binary_name": "nodejs",
            "binary_version": "20.19.4+dfsg-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-21636.json"

Ubuntu:26.10 / nodejs

Package

Name
nodejs
Purl
pkg:deb/ubuntu/nodejs?arch=source&distro=stonking

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

22.*
22.22.1+dfsg+~cs22.19.15-1ubuntu1
24.*
24.16.0+dfsg+~cs24.13.1-2ubuntu1
24.18.0+dfsg+~cs24.13.2-1ubuntu1
24.19.0+dfsg+~cs24.13.3-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libnode137",
            "binary_version": "24.19.0+dfsg+~cs24.13.3-1ubuntu1"
        },
        {
            "binary_name": "nodejs",
            "binary_version": "24.19.0+dfsg+~cs24.13.3-1ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-21636.json"