CVE-2026-44292: protobuf.js: Prototype injection in generated message constructors

May 12, 2026 (updated May 14, 2026)

protobufjs generated message constructors copied enumerable properties from a provided properties object without filtering the __proto__ key. If an application constructed a message from an attacker-controlled plain object, an own enumerable __proto__ property could alter the prototype of that individual message instance.

References

github.com/advisories/GHSA-fx83-v9x8-x52w
github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v7.5.6
github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v8.0.2
github.com/protobufjs/protobuf.js/security/advisories/GHSA-fx83-v9x8-x52w
nvd.nist.gov/vuln/detail/CVE-2026-44292

Code Behaviors & Features

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