{"affected":[{"affectedData":[{"product":"MessagePack","vendor":"neuecc","versions":[{"status":"affected","version":"< 1.9.11"},{"status":"affected","version":">= 2.0.0, < 2.1.90"}]},{"product":"MessagePack.ImmutableCollection","vendor":"neuecc","versions":[{"status":"affected","version":"< 1.9.11"},{"status":"affected","version":">= 2.0.0, < 2.1.90"}]},{"product":"MessagePack.ReactiveProperty","vendor":"neuecc","versions":[{"status":"affected","version":"< 1.9.11"},{"status":"affected","version":">= 2.0.0, < 2.1.90"}]},{"product":"MessagePack.UnityShims","vendor":"neuecc","versions":[{"status":"affected","version":"< 1.9.11"},{"status":"affected","version":">= 2.0.0, < 2.1.90"}]}],"source":"security-advisories@github.com"}],"configurations":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:messagepack:messagepack:*:*:*:*:*:c\\#:*:*","matchCriteriaId":"6E3E3D7A-9BC4-4387-9EBD-EE1DEE62266D","versionEndExcluding":"1.9.3","vulnerable":true},{"criteria":"cpe:2.3:a:messagepack:messagepack:*:*:*:*:*:c\\#:*:*","matchCriteriaId":"F24DBCF3-4F9D-4409-9343-7B258B4F1B3F","versionEndExcluding":"2.1.80","versionStartIncluding":"2.0.323","vulnerable":true},{"criteria":"cpe:2.3:a:messagepack:messagepack:2.0.94:alpha:*:*:*:c\\#:*:*","matchCriteriaId":"5507008B-B8F8-4147-8E65-1481E479ABE6","vulnerable":true},{"criteria":"cpe:2.3:a:messagepack:messagepack:2.0.110:alpha:*:*:*:c\\#:*:*","matchCriteriaId":"37BBAB86-0E12-4B68-A325-C168F7BB2C1C","vulnerable":true},{"criteria":"cpe:2.3:a:messagepack:messagepack:2.0.119:beta:*:*:*:c\\#:*:*","matchCriteriaId":"C1D65411-111F-4243-AFC7-F561CED839B7","vulnerable":true},{"criteria":"cpe:2.3:a:messagepack:messagepack:2.0.123:beta:*:*:*:c\\#:*:*","matchCriteriaId":"D61D5CEA-5EB9-4C11-B379-604D8DE9F368","vulnerable":true},{"criteria":"cpe:2.3:a:messagepack:messagepack:2.0.204:beta:*:*:*:c\\#:*:*","matchCriteriaId":"129F03B4-C739-4EE9-ADCA-D9DC9337101E","vulnerable":true},{"criteria":"cpe:2.3:a:messagepack:messagepack:2.0.270:rc:*:*:*:c\\#:*:*","matchCriteriaId":"C6BB270F-6012-4C07-A070-E1F13048A439","vulnerable":true},{"criteria":"cpe:2.3:a:messagepack:messagepack:2.0.299:rc:*:*:*:c\\#:*:*","matchCriteriaId":"CB524CF3-98FF-41DF-9C44-553ED740152D","vulnerable":true}],"negate":false,"operator":"OR"}]}],"cveTags":[],"descriptions":[{"lang":"en","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."},{"lang":"es","value":"MessagePack para C # y Unity anterior a la versión 1.9.11 y 2.1.90 tiene una vulnerabilidad en la que los datos no seguros pueden provocar un ataque DoS debido a colisiones hash y desbordamiento de pila. Revise el Aviso de seguridad de GitHub vinculado para obtener más información y pasos de reparación."}],"id":"CVE-2020-5234","lastModified":"2026-06-17T03:21:04.867","metrics":{"cvssMetricV2":[{"acInsufInfo":false,"baseSeverity":"MEDIUM","cvssData":{"accessComplexity":"LOW","accessVector":"NETWORK","authentication":"SINGLE","availabilityImpact":"COMPLETE","baseScore":6.8,"confidentialityImpact":"NONE","integrityImpact":"NONE","vectorString":"AV:N/AC:L/Au:S/C:N/I:N/A:C","version":"2.0"},"exploitabilityScore":8.0,"impactScore":6.9,"obtainAllPrivilege":false,"obtainOtherPrivilege":false,"obtainUserPrivilege":false,"source":"nvd@nist.gov","type":"Primary","userInteractionRequired":false}],"cvssMetricV31":[{"cvssData":{"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"},"exploitabilityScore":1.2,"impactScore":3.6,"source":"security-advisories@github.com","type":"Secondary"},{"cvssData":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"exploitabilityScore":2.8,"impactScore":3.6,"source":"nvd@nist.gov","type":"Primary"}]},"published":"2020-01-31T18:15:11.860","references":[{"source":"security-advisories@github.com","tags":["Patch","Third Party Advisory"],"url":"https://github.com/neuecc/MessagePack-CSharp/commit/56fa86219d01d0a183babbbbcb34abbdea588a02"},{"source":"security-advisories@github.com","url":"https://github.com/neuecc/MessagePack-CSharp/commit/f88684078698386df02204f13faeff098a61f007"},{"source":"security-advisories@github.com","url":"https://github.com/neuecc/MessagePack-CSharp/issues/810"},{"source":"security-advisories@github.com","tags":["Third Party Advisory"],"url":"https://github.com/neuecc/MessagePack-CSharp/security/advisories/GHSA-7q36-4xx7-xcxf"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch","Third Party Advisory"],"url":"https://github.com/neuecc/MessagePack-CSharp/commit/56fa86219d01d0a183babbbbcb34abbdea588a02"},{"source":"af854a3a-2127-422b-91ae-364da2661108","url":"https://github.com/neuecc/MessagePack-CSharp/commit/f88684078698386df02204f13faeff098a61f007"},{"source":"af854a3a-2127-422b-91ae-364da2661108","url":"https://github.com/neuecc/MessagePack-CSharp/issues/810"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"],"url":"https://github.com/neuecc/MessagePack-CSharp/security/advisories/GHSA-7q36-4xx7-xcxf"}],"sourceIdentifier":"security-advisories@github.com","vulnStatus":"Modified","weaknesses":[{"description":[{"lang":"en","value":"CWE-121"}],"source":"security-advisories@github.com","type":"Secondary"},{"description":[{"lang":"en","value":"CWE-787"}],"source":"nvd@nist.gov","type":"Primary"}]}