Bug 2460237 (CVE-2026-40879)

Summary: CVE-2026-40879 nest: Nest: Denial of Service via recursive JSON message handling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Nest, a framework for building scalable Node.js server-side applications. A remote attacker can exploit this vulnerability by sending numerous small, valid JSON (JavaScript Object Notation) messages within a single TCP (Transmission Control Protocol) frame. This action causes the application's handleData() function to recurse excessively, leading to a call stack overflow and ultimately a Denial of Service (DoS) condition. This can make the application unresponsive to legitimate users.
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Bug Depends On: 2461092    
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Description OSIDB Bzimport 2026-04-21 20:02:42 UTC
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.