Nodejs: A flaw in Node.js TLS hostname handling can cause Embedded-nul hostnames can lead to silent authority rebinding due to c-string truncation in… (CVE-2026-48930)
Description
A critical vulnerability in Node.js TLS hostname handling allows embedded null characters in hostnames to cause silent authority rebinding due to C-string truncation in resolver bindings. This flaw affects multiple supported Node.js release lines including versions 22, 24, and 26, as well as specific Ubuntu package versions. The vulnerability can lead to incorrect hostname verification during TLS connections, potentially compromising confidentiality, integrity, and availability. A patch is available for the affected versions.
CVSS v3.1
Score 9.8critical
Affected software
pkg:bitnami/nodepkg: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-2026-48930 is a critical vulnerability in Node.js TLS hostname handling where embedded null characters in hostnames cause silent authority rebinding due to C-string truncation in resolver bindings. This results in incorrect hostname verification during TLS connections. The issue affects multiple supported Node.js release lines including versions 22, 24, and 26, as well as several Ubuntu package versions. The vulnerability has a CVSS score of 9.8, indicating a high impact on confidentiality, integrity, and availability. A patch is available for the affected versions.
Potential Impact
The vulnerability allows attackers to exploit embedded null characters in TLS hostnames to bypass proper hostname verification, leading to silent authority rebinding. This can compromise the security guarantees of TLS connections, potentially allowing man-in-the-middle attacks or unauthorized access. The CVSS score of 9.8 reflects critical impact on confidentiality, integrity, and availability.
Mitigation Recommendations
A patch is available for the affected Node.js versions and Ubuntu packages. Users and administrators should apply the official patches promptly to mitigate this vulnerability. No additional mitigation steps are indicated beyond applying the patch.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- BIT-node-2026-48930
- Osv Schema Version
- 1.6.2
- Aliases
- ["CVE-2026-48930"]
- Ecosystems
- ["Bitnami"]
- Database Specific Severity
- Critical
- State
- PUBLISHED
Threat ID: 6aa005faacd9273b49ab6879
Added to database: 09/08/2026, 12:56:26 UTC
Last enriched: 10/18/2026, 05:33:21 UTC
Last updated: 10/23/2026, 01:15:24 UTC
Views: 76
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.