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CVE-2026-40879

7.5 high SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 7.5 · nestjsNVD modified 2026-10-26 21:10

Affected (CPE criteria) 1

  • cpe:2.3:a:nestjs:nest:*:*:*:*:*:node.js:*:*

References 1