CVE-2026-40879
7.5 · HIGHOverview
CVE-2026-40879 is a high-severity vulnerability affecting nestjs nest. It was published on April 21, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
Nest is a framework for building scalable Node.js server-side applications. Prior to 11.1.19, when an attacker sends many small, valid JSON messages in one TCP frame, handleData() recurses once per message; the buffer shrinks each call. maxBufferSize is never reached; call stack overflows instead. A ~47 KB payload is sufficient to trigger RangeError. This vulnerability is fixed in 11.1.19.
Remediation
Check the references section for vendor advisories and patches from nestjs. Update nest to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| nestjs | nest | >= 0, < 11.1.19 | Affected |
Frequently Asked Questions
What is CVE-2026-40879?
CVE-2026-40879 is a high-severity vulnerability affecting nestjs nest. It was published on April 21, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2026-40879?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-40879?
Check the references section for vendor advisories and patches from nestjs. Update nest to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-40879?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-40879 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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