Bug 2536016 (CVE-2026-89418)

Summary: CVE-2026-89418 google-protobuf: google-protobuf: Denial of Service via uncontrolled recursion in protobuf group field parsing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in google-protobuf. An unauthenticated remote attacker can send a specially crafted message containing deeply nested protobuf group fields to a Node.js service using the affected library. This uncontrolled recursion can cause the service to crash, leading to a Denial of Service (DoS) for legitimate users.
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Description OSIDB Bzimport 2026-09-17 13:38:34 UTC 
google-protobuf contains an unbounded recursion when parsing unknown protobuf group fields. An attacker can send a small crafted payload of deeply nested START_GROUP wire bytes to any Node.js service that calls the generated deserializeBinary() API, causing a RangeError: Maximum call stack size exceeded and crashing the process. No authentication or prior knowledge of the schema is required.