{"id":"CVE-2026-59877","aliases":["GHSA-j3f2-48v5-ccww"],"url":"https://o3.security/vulnerability/CVE-2026-59877","summary":"protobufjs: Denial of Service via infinite loop in .proto option parsing","details":"protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.6.5 and 8.6.6, protobufjs parsed option names by advancing through schema tokens until reaching an = token without checking for end of input, so a crafted .proto schema that opens an option declaration and ends prematurely can cause parse, Root.load, or Root.loadSync to loop indefinitely. This issue is fixed in versions 7.6.5 and 8.6.6.","published":"2026-07-08T15:28:07.696Z","modified":"2026-08-12T03:51:44.412969728Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},"epss":{"score":0.00365,"percentile":0.29231,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"protobufjs","fixedVersion":"7.6.5"},{"ecosystem":"npm","name":"protobufjs","fixedVersion":"8.6.6"}],"fix":{"url":"https://github.com/protobufjs/protobuf.js/commit/10fba6d54815ceecca8a06b9a6db490c8f5d2217","label":"protobufjs/protobuf.js@10fba6d"},"references":[{"type":"WEB","url":"https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v7.6.5"},{"type":"WEB","url":"https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v8.6.6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59877.json"},{"type":"ADVISORY","url":"https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-j3f2-48v5-ccww"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-59877"},{"type":"FIX","url":"https://github.com/protobufjs/protobuf.js/commit/10fba6d54815ceecca8a06b9a6db490c8f5d2217"},{"type":"FIX","url":"https://github.com/protobufjs/protobuf.js/commit/fa5c73add738ceb471e74da8cc2f3727c3d0a69f"},{"type":"FIX","url":"https://github.com/protobufjs/protobuf.js/pull/2352"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:44.412969728Z"}}