{"id":"CVE-2026-54270","revision":"f4479b8925474acb9a432128a668faf0","records":[{"revision":"f4479b8925474acb9a432128a668faf0","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-54270","aliases":[],"title":"protobufjs: Memory amplification from preserved unknown fields in binary decode","description":"protobufjs compiles protobuf definitions into JavaScript (JS) functions. From 8.2.0 to 8.4.2, protobufjs preserved unknown wire elements in message.$unknowns and did not provide a decode-time option to discard unknown fields before retaining them. A crafted protobuf payload containing many unknown fields could therefore cause a decoded message to retain substantially more memory than the input size would suggest, even when unknown-field round-tripping is not needed. protobufjs 8.5.0 added the relevant decode-time options, allowing applications that decode untrusted protobuf data to disable unknown-field retention during decode. protobufjs 8.6.2 flips the default so unknown fields are discarded unless explicitly opted into.","state":0,"publishedAt":"2026-06-22T16:19:20.449+00:00","modifiedAt":"2026-06-23T16:09:51.638+00:00","affected":[{"ecosystem":"Vendor product","name":"protobuf.js","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"protobufjs\",\n                    \"product\": \"protobuf.js\",\n                    \"versions\": [\n                        {\n                            \"version\": \">=8.2.0, < 8.5.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-94rc-8x27-4472"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-54270","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-54270","identifiers":["CVE-2026-54270"]},"retained":false,"historicalAffected":[]}],"coverage":[]}