CVE-2026-40879
Nest: DoS via Recursive handleData in JsonSocket (TCP Transport)
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-674 |
| Vendor | nestjs |
| Product | nest |
| Published | Apr 21, 2026 |
| Last Updated | Apr 21, 2026 |
Stay Ahead of the Next One
Get instant alerts for nestjs nest
Be the first to know when new high vulnerabilities affecting nestjs nest are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
nestjs / nest
< 11.1.19