{"id":"GHSA-j3f2-48v5-ccww","revision":"c46fa82c61a747b79d230dfca38110de","records":[{"revision":"c46fa82c61a747b79d230dfca38110de","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-j3f2-48v5-ccww","aliases":["CVE-2026-59877"],"title":"protobufjs: Denial of Service via infinite loop in .proto option parsing","description":"## Summary\n\nprotobufjs parsed option names by advancing through schema tokens until it reached an `=` token, without checking for end of input. A crafted `.proto` schema that opens an option declaration but ends prematurely could cause the option parser to loop without ever terminating.\n\nThis affects the reflection parsing path (`parse`, `Root.load`, `Root.loadSync`).\n\n## Impact\n\nAn attacker who can provide or influence `.proto` schema text parsed by an application may be able to cause the parsing call to never return. Because Node.js is single-threaded, the blocked event loop prevents all other work in the process, resulting in a denial of service that persists until the process is externally terminated.\n\nApplications that only encode or decode protobuf binary data with trusted schemas are not directly affected.\n\n## Preconditions\n\n- The application must parse `.proto` schema text influenced by an attacker.\n- The schema must be parsed through APIs such as `parse`, `Root.load`, or `Root.loadSync`.\n- The crafted input must begin an option declaration that ends before its `=` assignment.\n\n## Workarounds\n\nDo not parse `.proto` schemas from untrusted sources with affected versions. If untrusted schema text must be accepted, isolate parsing in a process or worker that can be safely terminated and bound it with a timeout, so a non-returning parse call cannot deny service to the rest of the application.","state":0,"publishedAt":"2026-07-20T22:03:00+00:00","modifiedAt":"2026-09-10T03:50:12.329163+00:00","affected":[{"ecosystem":"npm","name":"protobufjs","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"7.5.0"},{"kind":"fixed","version":"7.6.5"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"protobufjs","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"8.0.0"},{"kind":"fixed","version":"8.6.6"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-j3f2-48v5-ccww","https://nvd.nist.gov/vuln/detail/CVE-2026-59877","https://github.com/protobufjs/protobuf.js/pull/2352","https://github.com/protobufjs/protobuf.js/commit/10fba6d54815ceecca8a06b9a6db490c8f5d2217","https://github.com/protobufjs/protobuf.js/commit/fa5c73add738ceb471e74da8cc2f3727c3d0a69f","https://github.com/protobufjs/protobuf.js","https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v7.6.5","https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v8.6.6"],"sourceUrl":"https://github.com/advisories/GHSA-j3f2-48v5-ccww","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-j3f2-48v5-ccww","identifiers":["GHSA-j3f2-48v5-ccww","CVE-2026-59877"]},"retained":false,"historicalAffected":[]}],"coverage":[]}