CVE-2026-40879: Nest is a framework for building scalable Node.js server-side applications. Prior to 11.1.19, when an attacker sends man…
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.
- Published by source
- 2026-04-21
- First seen by Reality Radar
- 2026-10-27
- Last verified
- 2026-10-27
Affected
- Manufacturer
- nestjs
- Products
- nest
- Versions
- <11.1.19
- CPE
- cpe:2.3:a:nestjs:nest:*:*:*:*:*:node.js:*:*
Whether your exact unit is affected depends on the model, serial number and region in the official notice.
What the official notice says
Risk: CVSS 7.5
Is this affecting you?
Add what you own or use and Reality Radar will tell you when official changes match it — with evidence and next steps.
Sources
- NIST National Vulnerability Database Tier A · official published 2026-04-21
Evidence ledger
Every piece of evidence we store is appended to a public hash chain, so later edits are detectable. Anyone can re-verify it.
| Entry | Kind | Observed | Evidence hash | Entry hash |
|---|---|---|---|---|
| #2149 | new | 2026-10-27 | 7dd1261e775d…9b147e | 4b6cf69bacf9…0e566f |
Chain head: #2286 e212558e872c…954bc1