Nodejs: A flaw in Node.js Permission API can cause a local server to be started (via a Unix domain socket), even without the --allow-net permission. (CVE-2026-48936)
Description
A vulnerability in the Node.js Permission API allows a local server to be started via a Unix domain socket even when the --allow-net permission is not granted. This flaw affects Node.js version 26.3.0 and certain Ubuntu package versions. The issue was fixed in Node.js version 26.3.1. The severity is considered low to medium with no known exploits in the wild.
CVSS v3.0
Score 3.3low
Affected software
pkg:deb/ubuntu/nodejs?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/nodejs?arch=source&distro=esm-apps/xenialpkg:deb/ubuntu/nodejs?arch=source&distro=esm-apps/bionicpkg:deb/ubuntu/nodejs?arch=source&distro=esm-apps/focalpkg:deb/ubuntu/nodejs?arch=source&distro=esm-apps/jammypkg:deb/ubuntu/nodejs?arch=source&distro=noblepkg:deb/ubuntu/nodejs?arch=source&distro=questingpkg:deb/ubuntu/nodejs?arch=source&distro=stonkingpkg:deb/ubuntu/nodejs?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-48936 is a vulnerability in the Node.js Permission API that permits starting a local server through a Unix domain socket without requiring the --allow-net permission. This bypass of expected permission restrictions could allow limited unauthorized local network operations. The flaw affects Node.js version 26.3.0 and specific Ubuntu package versions listed. The issue was addressed and fixed in Node.js version 26.3.1.
Potential Impact
The vulnerability allows a local attacker with limited permissions to start a local server via a Unix domain socket without the --allow-net permission. This could lead to unintended local network service exposure or interference. The CVSS score is 3.3 (low to medium severity), indicating limited impact with no confidentiality or availability impact and only low integrity impact. There are no known exploits in the wild.
Mitigation Recommendations
A fix is available in Node.js version 26.3.1. Users and administrators should upgrade affected Node.js installations to version 26.3.1 or later. For affected Ubuntu package versions, apply the corresponding security updates provided by the distribution. No additional mitigation is indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- BIT-node-2026-48936
- Osv Schema Version
- 1.6.2
- Aliases
- ["CVE-2026-48936"]
- Ecosystems
- ["Bitnami"]
- Database Specific Severity
- Low
- State
- PUBLISHED
Threat ID: 6aa005f8acd9273b49ab6855
Added to database: 09/08/2026, 12:56:24 UTC
Last enriched: 10/18/2026, 05:32:56 UTC
Last updated: 10/21/2026, 13:20:22 UTC
Views: 36
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