{"id":"CVE-2020-5234","details":"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.","aliases":["GHSA-7q36-4xx7-xcxf"],"modified":"2026-06-18T03:54:38.288373577Z","published":"2020-01-31T18:15:11.860Z","database_specific":{"unresolved_ranges":[{"extracted_events":[{"fixed":"1.9.3"},{"introduced":"2.0.323"},{"fixed":"2.1.80"}],"source":"CPE_RANGE","vendor_product":"messagepack:messagepack","cpes":["cpe:2.3:a:messagepack:messagepack:*:*:*:*:*:c\\#:*:*"]},{"source":"CPE_STRING","vendor_product":"messagepack:messagepack","cpes":["cpe:2.3:a:messagepack:messagepack:2.0.110:alpha:*:*:*:c\\#:*:*","cpe:2.3:a:messagepack:messagepack:2.0.119:beta:*:*:*:c\\#:*:*","cpe:2.3:a:messagepack:messagepack:2.0.123:beta:*:*:*:c\\#:*:*","cpe:2.3:a:messagepack:messagepack:2.0.204:beta:*:*:*:c\\#:*:*","cpe:2.3:a:messagepack:messagepack:2.0.270:rc:*:*:*:c\\#:*:*","cpe:2.3:a:messagepack:messagepack:2.0.299:rc:*:*:*:c\\#:*:*","cpe:2.3:a:messagepack:messagepack:2.0.94:alpha:*:*:*:c\\#:*:*"],"extracted_events":[{"last_affected":"2.0.94-alpha"},{"last_affected":"2.0.110-alpha"},{"last_affected":"2.0.119-beta"},{"last_affected":"2.0.123-beta"},{"last_affected":"2.0.204-beta"},{"last_affected":"2.0.270-rc"},{"last_affected":"2.0.299-rc"}]}]},"references":[{"type":"ADVISORY","url":"https://github.com/neuecc/MessagePack-CSharp/security/advisories/GHSA-7q36-4xx7-xcxf"},{"type":"REPORT","url":"https://github.com/neuecc/MessagePack-CSharp/issues/810"},{"type":"FIX","url":"https://github.com/neuecc/MessagePack-CSharp/commit/56fa86219d01d0a183babbbbcb34abbdea588a02"},{"type":"FIX","url":"https://github.com/neuecc/MessagePack-CSharp/commit/f88684078698386df02204f13faeff098a61f007"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/MessagePack-CSharp/MessagePack-CSharp","events":[{"introduced":"0"},{"fixed":"6cbd8196e7dbe9b8810d7620f4542c3db9388753"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.9.11"}],"source":"DESCRIPTION"}}],"versions":["v1.9.3","v1.8.80","v1.8.74","v1.8.71-beta","v.1.7.3.6","v1.7.3.4","v.1.7.3.5","v1.7.3.3","v1.7.3.2","v1.7.3.1","v1.7.3","v1.7.2","v1.7.0","v1.6.2","v1.6.1.2","v1.6.1","v1.6.0","v1.5.1","v1.5.0","v1.4.4","v1.4.2","v1.4.1","v1.4.0","v1.3.3","v1.3.2","v1.3.1","v1.3.0","v1.2.3","v1.2.1","v1.2.0","v1.1.2","v1.1.1","v1.0.3","v1.0.2","1.0.1","0.2.0-beta","0.1.0-beta"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2020-5234.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/messagepack-csharp/messagepack-csharp","events":[{"introduced":"0"},{"fixed":"56fa86219d01d0a183babbbbcb34abbdea588a02"},{"fixed":"f88684078698386df02204f13faeff098a61f007"}],"database_specific":{"source":"REFERENCES"}}],"versions":["v2.1.80","v2.0.270-rc","v2.0.204-beta","v2.0.123-beta","v2.0.119-beta","v2.0.110-alpha","v2.0.94-alpha","v1.7.3.4","v1.7.3.3","v1.7.3.2","v1.7.3.1","v1.7.3","v1.7.2","v1.7.0","v1.6.2","v1.6.1.2","v1.6.1","v1.6.0","v1.5.1","v1.5.0","v1.4.4","v1.4.2","v1.4.1","v1.4.0","v1.3.3","v1.3.2","v1.3.1","v1.3.0","v1.2.3","v1.2.1","v1.2.0","v1.1.2","v1.1.1","v1.0.3","v1.0.2","1.0.1","0.2.0-beta","0.1.0-beta"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2020-5234.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}