{"api_version":"1","generated_at":"2026-06-25T03:17:08+00:00","cve":"CVE-2020-5234","urls":{"html":"https://cve.report/CVE-2020-5234","api":"https://cve.report/api/cve/CVE-2020-5234.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2020-5234","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-5234"},"summary":{"title":"CVE-2020-5234","description":"MessagePack for C# and Unity before version 1.9.11 and 2.1.90 has a vulnerability where untrusted data can lead to DoS attack due to hash collisions and stack overflow. Review the linked GitHub Security Advisory for more information and remediation steps.","state":"PUBLIC","assigner":"security-advisories@github.com","published_at":"2020-01-31 18:15:00","updated_at":"2020-02-24 23:15:00"},"problem_types":["CWE-787"],"metrics":[],"references":[{"url":"https://github.com/neuecc/MessagePack-CSharp/security/advisories/GHSA-7q36-4xx7-xcxf","name":"https://github.com/neuecc/MessagePack-CSharp/security/advisories/GHSA-7q36-4xx7-xcxf","refsource":"CONFIRM","tags":["Third Party Advisory"],"title":"Untrusted data can lead to DoS attack due to hash collisions and stack overflow · Advisory · neuecc/MessagePack-CSharp · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"0"},{"url":"https://github.com/neuecc/MessagePack-CSharp/issues/810","name":"https://github.com/neuecc/MessagePack-CSharp/issues/810","refsource":"MISC","tags":[],"title":"MessagePackSecurity.GetEqualityComparer<object> returns null on copied instances · Issue #810 · neuecc/MessagePack-CSharp · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/neuecc/MessagePack-CSharp/commit/56fa86219d01d0a183babbbbcb34abbdea588a02","name":"https://github.com/neuecc/MessagePack-CSharp/commit/56fa86219d01d0a183babbbbcb34abbdea588a02","refsource":"MISC","tags":["Patch","Third Party Advisory"],"title":"Merge security fixes in for v2.1 · neuecc/MessagePack-CSharp@56fa862 · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/neuecc/MessagePack-CSharp/commit/f88684078698386df02204f13faeff098a61f007","name":"https://github.com/neuecc/MessagePack-CSharp/commit/f88684078698386df02204f13faeff098a61f007","refsource":"MISC","tags":[],"title":"Merge pull request #811 from AArnott/fixNullHasher · neuecc/MessagePack-CSharp@f886840 · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-5234","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5234","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2020","cve_id":"5234","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"messagepack","cpe5":"messagepack","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"c\\#","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"5234","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"messagepack","cpe5":"messagepack","cpe6":"2.0.110","cpe7":"alpha","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"c\\#","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"5234","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"messagepack","cpe5":"messagepack","cpe6":"2.0.119","cpe7":"beta","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"c\\#","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"5234","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"messagepack","cpe5":"messagepack","cpe6":"2.0.123","cpe7":"beta","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"c\\#","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"5234","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"messagepack","cpe5":"messagepack","cpe6":"2.0.204","cpe7":"beta","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"c\\#","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"5234","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"messagepack","cpe5":"messagepack","cpe6":"2.0.270","cpe7":"rc","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"c\\#","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"5234","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"messagepack","cpe5":"messagepack","cpe6":"2.0.299","cpe7":"rc","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"c\\#","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"5234","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"messagepack","cpe5":"messagepack","cpe6":"2.0.94","cpe7":"alpha","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"c\\#","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"5234","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"messagepack","cpe5":"messagepack","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"c\\#","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"5234","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"messagepack","cpe5":"messagepack","cpe6":"2.0.110","cpe7":"alpha","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"c\\#","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"5234","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"messagepack","cpe5":"messagepack","cpe6":"2.0.119","cpe7":"beta","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"c\\#","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"5234","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"messagepack","cpe5":"messagepack","cpe6":"2.0.123","cpe7":"beta","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"c\\#","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"5234","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"messagepack","cpe5":"messagepack","cpe6":"2.0.204","cpe7":"beta","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"c\\#","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"5234","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"messagepack","cpe5":"messagepack","cpe6":"2.0.270","cpe7":"rc","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"c\\#","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"5234","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"messagepack","cpe5":"messagepack","cpe6":"2.0.299","cpe7":"rc","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"c\\#","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"5234","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"messagepack","cpe5":"messagepack","cpe6":"2.0.94","cpe7":"alpha","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"c\\#","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2020-5234","qid":"982818","title":"Dotnet (nuget) Security Update for MessagePack.UnityShims (GHSA-7q36-4xx7-xcxf)"}]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"security-advisories@github.com","ID":"CVE-2020-5234","STATE":"PUBLIC","TITLE":"Untrusted data can lead to DoS attack in MessagePack for C# and Unity"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"MessagePack","version":{"version_data":[{"version_value":"< 1.9.11"},{"version_value":">= 2.0.0, < 2.1.90"}]}},{"product_name":"MessagePack.ImmutableCollection","version":{"version_data":[{"version_value":"< 1.9.11"},{"version_value":">= 2.0.0, < 2.1.90"}]}},{"product_name":"MessagePack.ReactiveProperty","version":{"version_data":[{"version_value":"< 1.9.11"},{"version_value":">= 2.0.0, < 2.1.90"}]}},{"product_name":"MessagePack.UnityShims","version":{"version_data":[{"version_value":"< 1.9.11"},{"version_value":">= 2.0.0, < 2.1.90"}]}}]},"vendor_name":"neuecc"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"MessagePack for C# and Unity before version 1.9.11 and 2.1.90 has a vulnerability where untrusted data can lead to DoS attack due to hash collisions and stack overflow. Review the linked GitHub Security Advisory for more information and remediation steps."}]},"impact":{"cvss":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":4.8,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-121: Stack-based Buffer Overflow"}]}]},"references":{"reference_data":[{"name":"https://github.com/neuecc/MessagePack-CSharp/security/advisories/GHSA-7q36-4xx7-xcxf","refsource":"CONFIRM","url":"https://github.com/neuecc/MessagePack-CSharp/security/advisories/GHSA-7q36-4xx7-xcxf"},{"name":"https://github.com/neuecc/MessagePack-CSharp/commit/56fa86219d01d0a183babbbbcb34abbdea588a02","refsource":"MISC","url":"https://github.com/neuecc/MessagePack-CSharp/commit/56fa86219d01d0a183babbbbcb34abbdea588a02"},{"name":"https://github.com/neuecc/MessagePack-CSharp/issues/810","refsource":"MISC","url":"https://github.com/neuecc/MessagePack-CSharp/issues/810"},{"name":"https://github.com/neuecc/MessagePack-CSharp/commit/f88684078698386df02204f13faeff098a61f007","refsource":"MISC","url":"https://github.com/neuecc/MessagePack-CSharp/commit/f88684078698386df02204f13faeff098a61f007"}]},"source":{"advisory":"GHSA-7q36-4xx7-xcxf","discovery":"UNKNOWN"}},"nvd":{"publishedDate":"2020-01-31 18:15:00","lastModifiedDate":"2020-02-24 23:15:00","problem_types":["CWE-787"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM"},"exploitabilityScore":2.8,"impactScore":3.6},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:L/Au:S/C:N/I:N/A:C","accessVector":"NETWORK","accessComplexity":"LOW","authentication":"SINGLE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"COMPLETE","baseScore":6.8},"severity":"MEDIUM","exploitabilityScore":8,"impactScore":6.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:messagepack:messagepack:2.0.94:alpha:*:*:*:c\\#:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:messagepack:messagepack:2.0.110:alpha:*:*:*:c\\#:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:messagepack:messagepack:2.0.119:beta:*:*:*:c\\#:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:messagepack:messagepack:2.0.123:beta:*:*:*:c\\#:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:messagepack:messagepack:2.0.204:beta:*:*:*:c\\#:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:messagepack:messagepack:2.0.270:rc:*:*:*:c\\#:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:messagepack:messagepack:2.0.299:rc:*:*:*:c\\#:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:messagepack:messagepack:*:*:*:*:*:c\\#:*:*","versionStartIncluding":"2.0.323","versionEndExcluding":"2.1.80","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:messagepack:messagepack:*:*:*:*:*:c\\#:*:*","versionEndExcluding":"1.9.3","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2020","CveId":"5234","Ordinal":"165448","Title":"CVE-2020-5234","CVE":"CVE-2020-5234","Year":"2020"},"notes":[{"CveYear":"2020","CveId":"5234","Ordinal":"1","NoteData":"MessagePack for C# and Unity before version 1.9.11 and 2.1.90 has a vulnerability where untrusted data can lead to DoS attack due to hash collisions and stack overflow. Review the linked GitHub Security Advisory for more information and remediation steps.","Type":"Description","Title":null},{"CveYear":"2020","CveId":"5234","Ordinal":"2","NoteData":"2020-01-31","Type":"Other","Title":"Published"},{"CveYear":"2020","CveId":"5234","Ordinal":"3","NoteData":"2020-02-24","Type":"Other","Title":"Modified"}]}}}