Six Proto6 Vulnerabilities in protobuf.js Expose Node.js Apps to RCE and DoS
Jun 10, 2026
Vulnerability / JavaScript
Cybersecurity researchers have flagged half a dozen vulnerabilities in protobuf.js, a JavaScript and TypeScript implementation of Protocol Buffers ( Protobuf ), that, if successfully exploited, could result in remote code execution (RCE) and denial-of-service (DoS) attacks. "In affected environments, a single malicious protobuf schema, descriptor, or crafted payload could be enough to trigger crashes, runtime corruption, or even code execution," Cyera security researcher Assaf Morag said . The vulnerabilities have been codenamed Proto6 . Protobuf is a free and open-source, language-agnostic mechanism for serializing structured data. It was originally developed and used internally by Google before it was made publicly available in 2008. The identified vulnerabilities affect Node.js applications that use protobuf.js, Google Cloud client libraries, messaging frameworks like Baileys , and CI/CD pipelines. Per Cyera, any Node.js service that deserializes Protobuf data or ge...
