{"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":"2026-05-16T03:55:57.133425974Z","published":"2020-01-31T18:15:11.860Z","database_specific":{"unresolved_ranges":[{"cpes":["cpe:2.3:a:messagepack:messagepack:*:*:*:*:*:c\\#:*:*","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":[{"fixed":"1.9.3"},{"introduced":"2.0.323"},{"fixed":"2.1.80"},{"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"}],"source":"CPE_FIELD","vendor_product":"messagepack:messagepack"}]},"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"}],"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"}]}