CVE-2026-89418
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.
- Published Sep 17, 2026
- CVSS 8.7 high
- 0.3% chance of exploitation in the next 30 days (EPSS)