CVE-2026-54271: protobufjs-cli: Code injection in pbjs static output from crafted JSON descriptor names

June 15, 2026

A previous fix for unsafe name handling in pbjs static / static-module code generation was incomplete. Affected versions of protobufjs-cli could still emit unsafe JavaScript references when generating static output from crafted JSON descriptor input. The common case of parsing schemas from .proto files is not affected.

This is a bypass of GHSA-6r35-46g8-jcw9 / CVE-2026-44295.

References

github.com/advisories/GHSA-pr59-h9ph-3fr8
github.com/protobufjs/protobuf.js/security/advisories/GHSA-pr59-h9ph-3fr8
nvd.nist.gov/vuln/detail/CVE-2026-54271

Code Behaviors & Features

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