CVE-2026-45740: protobufjs: Denial of Service via unbounded recursive JSON descriptor expansion

May 19, 2026

protobufjs could recurse without a depth limit while expanding nested JSON descriptors through Root.fromJSON() and Namespace.addJSON().

A crafted JSON descriptor with deeply nested namespace definitions could cause the JavaScript call stack to be exhausted during descriptor loading.

References

github.com/advisories/GHSA-jggg-4jg4-v7c6
github.com/protobufjs/protobuf.js/security/advisories/GHSA-jggg-4jg4-v7c6
nvd.nist.gov/vuln/detail/CVE-2026-45740

Code Behaviors & Features

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