Vulnerability Intelligence Report
Nest: DoS via Recursive handleData in JsonSocket (TCP Transport)
CVE-2026-40879
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.
No Active Exploit Signals
CVSS Base Score
7.5
HIGH
Exploitability:3.9
Impact Score:3.6
EPSS Probability:0.33%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-674 ↗CWE-674: Uncontrolled Recursion
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| nestjs | nest | < 11.1.19 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.329%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | GitHub, Inc. · Vendor · USA |
| Reserved | 2026-04-15T15:57:41 |
| Published | 2026-04-21T19:14:17 |
| Last Updated | 2026-04-21T19:38:04 |
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