CVE-2026-40879
HIGHNest: DoS via Recursive handleData in JsonSocket (TCP Transport)
Title source: cnaDescription
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.
Scores
CVSS v3
7.5
EPSS
0.0006
EPSS Percentile
17.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-674
Status
published
Products (1)
nestjs/nest
< 11.1.19 (2 CPE variants)
Published
Apr 21, 2026
Tracked Since
Apr 22, 2026