EUVD-2026-88511
GHSA-m8vh-jmq9-5rjg
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Remote unauthenticated single message crashes the process with no user interaction (AV:N/AC:L/PR:N/UI:N); impact is availability-only, so C:N/I:N/A:H.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
7DescriptionCVE.org
Nest is a framework for building scalable Node.js server-side applications. Prior to 11.2.4 and 12.0.2, a single message with a deeply nested object in its pattern can terminate a NestJS microservice using the TCP or RabbitMQ transport. ServerTCP#handleMessage and ServerRMQ#handleMessage pass a client-controlled non-string pattern to JSON.stringify to derive the handler lookup key; sufficiently deep nesting throws RangeError: Maximum call stack size exceeded, and the unhandled promise rejection terminates Node.js under its default behavior. An attacker who can reach the TCP port or publish to the consumed RabbitMQ queue or exchange can crash the service on demand; other transports are not affected because their patterns arrive as strings. This issue is fixed in versions 11.2.4 and 12.0.2.
Articles & Coverage 1
AnalysisAI
A remote, unauthenticated denial-of-service condition in the NestJS (Nest) microservices framework lets an attacker crash a service on demand by sending a single message whose 'pattern' field is a deeply nested object. Only deployments using the TCP transport (ServerTCP) or the RabbitMQ transport (ServerRMQ) are exposed, because those paths pass a client-controlled, non-string pattern into JSON.stringify to compute the handler lookup key; sufficient nesting throws 'RangeError: Maximum call stack size exceeded', and the unhandled promise rejection terminates the Node.js process under default behavior. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the NestJS application to run as a microservice using specifically the TCP transport (ServerTCP) or the RabbitMQ transport (ServerRMQ) - all other transports are unaffected because their patterns arrive as strings and never reach the vulnerable JSON.stringify path. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (7.5, AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) accurately captures a pure availability-loss network DoS: remote, unauthenticated, low-complexity, no user interaction, with no confidentiality or integrity impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade to NestJS 11.2.4 (for the 11.x line) or 12.0.2 (for the 12.x line), which are the versions where the pattern-serialization and unhandled-rejection paths are corrected (see GHSA-m8vh-jmq9-5rjg and releases v11.2.4 / v12.0.2). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every NestJS service in the estate and determine which run version 11.2.4 or earlier on the 11.x line, or 12.0.2 or earlier on the 12.x line, and which of those use ServerTCP or ServerRMQ rather than HTTP/gRPC transports; for each confirmed instance, block the raw TCP port and the RabbitMQ queue/exchange from any untrusted network segment using firewall rules, Kubernetes NetworkPolicy, or security-group changes, restrict broker permissions so only known producer identities can publish to consumed queues, and enable process supervision (systemd, PM2, container restart policy) with alerting so crashes are detected and recovered automatically. …
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External POC / Exploit Code
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