{"schema_version":"1.7.5","id":"GHSA-h9q6-hc68-35rp","published":"2026-03-18T12:59:54Z","modified":"2026-05-29T02:29:19.015956928Z","aliases":["CVE-2026-32284","GO-2026-4513","GO-2026-4740"],"related":["CGA-xwfm-7hvm-p6pw"],"summary":"Denial of service in github.com/shamaton/msgpack","details":"The msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data (format codes 0xd4-0xd8). This can lead to an out-of-bounds read and a runtime panic, allowing a denial of service attack.","affected":[{"package":{"name":"github.com/shamaton/msgpack/v2","ecosystem":"Go","purl":"pkg:golang/github.com/shamaton/msgpack/v2"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"2.4.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-h9q6-hc68-35rp/GHSA-h9q6-hc68-35rp.json"}},{"package":{"name":"github.com/shamaton/msgpack/v3","ecosystem":"Go","purl":"pkg:golang/github.com/shamaton/msgpack/v3"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"3.1.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-h9q6-hc68-35rp/GHSA-h9q6-hc68-35rp.json"}}],"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-32284"},{"type":"WEB","url":"https://github.com/golang/vulndb/issues/4513"},{"type":"WEB","url":"https://github.com/shamaton/msgpack/issues/59"},{"type":"PACKAGE","url":"https://github.com/shamaton/msgpack"},{"type":"WEB","url":"https://pkg.go.dev/vuln/GO-2026-4513"},{"type":"WEB","url":"https://securityinfinity.com/research/shamaton-msgpack-oob-panic-fixext-dos-2026"}],"database_specific":{"cwe_ids":["CWE-125"],"github_reviewed":true,"github_reviewed_at":"2026-03-18T12:59:54Z","nvd_published_at":"2026-03-26T20:16:12Z","severity":"HIGH"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}