Bug 2567919 (CVE-2026-97705)

Summary: CVE-2026-97705 moleculer: Moleculer: Denial of Service via malformed packet length in TCP transporter
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerability-draftAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Moleculer. A remote, unauthenticated attacker can cause a Denial of Service (DoS) by sending a malformed network packet with a negative length value to an exposed TCP (Transmission Control Protocol) transporter. This input triggers an infinite loop that blocks the application event loop, rendering all services in the process completely unresponsive until restarted.
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Description OSIDB Bzimport 2026-11-05 22:36:20 UTC 
Moleculer is a progressive microservices framework for Node.js. Prior to 0.14.36 and 0.15.2, Parser._write in src/transporters/tcp/parser.js used Buffer.prototype.readInt32BE to read a signed packet length, so a remote unauthenticated peer could supply a negative value that caused packet.slice(length) to return the unchanged buffer while the while (packet.length > 0) loop continued indefinitely. The synchronous loop blocked the Node.js event loop and made every service in the process unresponsive until restart. The TCP transporter must be enabled and reachable, and neither CRC validation nor maxPacketSize prevents the malformed length value. This issue is fixed in versions 0.14.36 and 0.15.2.