CVE-2026-40879 | nestjs nest up to 11.1.18 JSON Message handleData recursion (GHSA-hpwf-8g29-85qm)

VDB-358591 · CVE-2026-40879 · GHSA-HPWF-8G29-85QM NESTJS NEST UP TO 11.1.18 JSON MESSAGE HANDLEDATA RECURSION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.3 $0-$5k 1.78+ Summaryinfo A vulnerability identified as problematic has been detected in nestjs nest up to 11.1.18. This affects the function handleData of the component JSON Message Handler. This manipulation causes recursion. This vulnerability is handled as CVE-2026-40879. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component. Detailsinfo A vulnerability has been found in nestjs nest up to 11.1.18 and classified as problematic. Affected by this vulnerability is the function handleData of the component JSON Message Handler. The manipulation with an unknown input leads to a recursion vulnerability. The CWE definition for the vulnerability is CWE-674. The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. As an impact it is known to affect availability. The summary by CVE is: 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. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-40879 since 04/15/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK. Upgrading to version 11.1.19 eliminates this vulnerability. Productinfo Vendor nestjs Name nest Version 11.1.0 11.1.1 11.1.2 11.1.3 11.1.4 11.1.5 11.1.6 11.1.7 11.1.8 11.1.9 11.1.10 11.1.11 11.1.12 11.1.13 11.1.14 11.1.15 11.1.16 11.1.17 11.1.18 Website Product: https://github.com/nestjs/nest/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.4 VulDB Meta Temp Score: 6.3 VulDB Base Score: 5.3 VulDB Temp Score: 5.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 7.5 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Recursion CWE: CWE-674 / CWE-404 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: nest 11.1.19 Timelineinfo 04/15/2026 CVE reserved 04/21/2026 +6 days Advisory disclosed 04/21/2026 +0 days VulDB entry created 04/21/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: GHSA-hpwf-8g29-85qm Status: Confirmed CVE: CVE-2026-40879 (🔒) GCVE (CVE): GCVE-0-2026-40879 GCVE (VulDB): GCVE-100-358591 Entryinfo Created: 04/21/2026 22:37 Changes: 04/21/2026 22:37 (65) Complete: 🔍 Cache ID: 99:B28:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸