{"action":"Upgrade MessagePack to 2.5.301 (2.x) or 3.1.7 (3.x) or later.","affected":[{"fixed":"2.5.301","introduced":"0"},{"fixed":"3.1.7","introduced":"3.0"}],"component":"MessagePack","cve_ids":["CVE-2026-48517"],"ecosystem":"NuGet","epss":0.00348,"exploited":false,"fixed_versions":["2.5.301","3.1.7"],"ghsa_id":"GHSA-qhmf-xw27-6rqr","id":"tcs_01M5N8Y4PNJHTSJSV0JW52WJXE","modified_at":"2026-06-25T21:56:26.175947Z","published_at":"2026-06-25T21:31:13Z","references":["https://osv.dev/vulnerability/GHSA-qhmf-xw27-6rqr","https://github.com/MessagePack-CSharp/MessagePack-CSharp/security/advisories/GHSA-qhmf-xw27-6rqr","https://nvd.nist.gov/vuln/detail/CVE-2026-48517","https://github.com/MessagePack-CSharp/MessagePack-CSharp"],"severity":{"label":"medium"},"sources":[{"source":"osv","source_id":"GHSA-qhmf-xw27-6rqr","url":"https://osv.dev/vulnerability/GHSA-qhmf-xw27-6rqr"}],"summary":"MessagePack-CSharp: Typeless deserialization type restrictions do not recurse into arrays or generic arguments"}