{"id":"CVE-2026-54270","sourceIdentifier":"security-advisories@github.com","published":"2026-06-22T18:16:45.480","lastModified":"2026-06-24T20:39:18.323","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"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."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"protobufjs","product":"protobuf.js","versions":[{"version":">=8.2.0, < 8.5.0","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"LOW"},"exploitabilityScore":3.9,"impactScore":1.4}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-06-23T14:47:41.353008Z","id":"CVE-2026-54270","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-770"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:protobufjs_project:protobufjs:*:*:*:*:*:node.js:*:*","versionStartIncluding":"8.2.0","versionEndExcluding":"8.5.0","matchCriteriaId":"A722DAF4-51C8-4165-8DFB-72D52BC31853"}]}]}],"references":[{"url":"https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-94rc-8x27-4472","source":"security-advisories@github.com","tags":["Mitigation","Vendor Advisory"]}]}