{"id":"EUVD-2026-30026","revision":null,"records":[{"revision":"4820cc368c5f45c383e8b5e272184bb5","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-44288","aliases":[],"title":"protobufjs: Overlong UTF-8 decoding","description":"protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs includes a minimal UTF-8 decoder that accepted overlong UTF-8 byte sequences and decoded them to their canonical characters instead of replacing them. An attacker who can provide protobuf binary data decoded through the affected UTF-8 path may be able to bypass application-level checks that inspect raw bytes before protobuf string decoding. For example, bytes that do not contain certain ASCII characters could decode to strings containing those characters. This vulnerability is fixed in 7.5.6 and 8.0.2.","state":0,"publishedAt":"2026-05-13T14:37:26.624+00:00","modifiedAt":"2026-05-13T18:33:51.296+00:00","affected":[{"ecosystem":"Vendor product","name":"protobuf.js","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"protobufjs\",\n                    \"product\": \"protobuf.js\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 7.5.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 8.0.0, < 8.0.2\",\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:L/A:N","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-q6x5-8v7m-xcrf"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-44288","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-44288","identifiers":["CVE-2026-44288"]},"retained":false,"historicalAffected":[]},{"revision":"de4ae522556741de95211c17866188a2","observedAt":"2026-11-15T13:10:48.526+00:00","statement":{"source":"euvd","id":"EUVD-2026-30026","aliases":["CVE-2026-44288","GHSA-q6x5-8v7m-xcrf"],"title":"protobufjs compiles protobuf definitions into JavaScript (JS) functions. 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This vulnerability is fixed in 7.5.6 and 8.0.2.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3,"severity":null}],"references":["https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-q6x5-8v7m-xcrf"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30026","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 13, 2026, 2:37:26 PM","dateUpdated":"May 13, 2026, 6:33:51 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. 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Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-44288","identifiers":["CVE-2026-44288"]},"retained":false,"historicalAffected":[]},{"revision":"b718c6b14f0e4b1094bb2bfeb93ffd24","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-q6x5-8v7m-xcrf","aliases":["CVE-2026-44288"],"title":"protobufjs has overlong UTF-8 decoding","description":"## Summary\n\nprotobufjs includes a minimal UTF-8 decoder used in non-Node and fallback decoding paths. The affected decoder accepted overlong UTF-8 byte sequences and decoded them to their canonical characters instead of replacing them.\n\nThe issue concerns overlong encodings and code points outside the Unicode range. protobufjs may still accept some non-strict UTF-8 input for compatibility, so applications should not rely on protobufjs as a general-purpose strict UTF-8 validator.\n\n## Impact\n\nAn attacker who can provide protobuf binary data decoded through the affected UTF-8 path may be able to bypass application-level checks that inspect raw bytes before protobuf string decoding. For example, bytes that do not contain certain ASCII characters could decode to strings containing those characters.\n\nThe practical impact depends on downstream application validation and how decoded strings are used. Node.js Buffer-backed decoding paths are not directly affected when they use Node's native UTF-8 decoding.\n\n## Preconditions\n\n- The application must decode protobuf binary data influenced by an attacker.\n- The affected protobuf string field must be decoded through protobufjs's minimal UTF-8 decoder rather than a native UTF-8 decoder.\n- The application must rely on byte-level filtering or validation before protobuf string decoding.\n- The decoded string must then be used in a security-sensitive context.\n\n## Workarounds\n\nAvoid relying only on byte-level filtering before protobuf string decoding with affected versions. Validate decoded strings at the point where they are used, and prefer runtime paths that use native UTF-8 decoding where necessary.","state":0,"publishedAt":"2026-05-12T15:00:11+00:00","modifiedAt":"2026-09-10T03:50:55.2841106+00:00","affected":[{"ecosystem":"npm","name":"protobufjs","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"7.5.6"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"protobufjs","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"8.0.0"},{"kind":"fixed","version":"8.0.2"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@protobufjs/utf8","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.1.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-q6x5-8v7m-xcrf","https://nvd.nist.gov/vuln/detail/CVE-2026-44288","https://github.com/protobufjs/protobuf.js","https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v7.5.6","https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v8.0.2"],"sourceUrl":"https://github.com/advisories/GHSA-q6x5-8v7m-xcrf","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-q6x5-8v7m-xcrf","identifiers":["GHSA-q6x5-8v7m-xcrf","CVE-2026-44288"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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