CVE-2026-89418 is a vulnerability in Google Protobuf
Published on September 17, 2026
Uncontrolled Recursion leading to Denial of Service in protobuf-javascript (google-protobuf)
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.
Vulnerability Analysis
CVE-2026-89418 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. An automatable proof of concept (POC) exploit exists. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is a Stack Exhaustion Vulnerability?
The product does not properly control the amount of recursion which takes place, consuming excessive resources, such as allocated memory or the program stack.
CVE-2026-89418 has been classified to as a Stack Exhaustion vulnerability or weakness.
Products Associated with CVE-2026-89418
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