{"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-2026-48513"],"ecosystem":"NuGet","epss":0.00405,"exploited":false,"fixed_versions":["2.5.301","3.1.7"],"ghsa_id":"GHSA-wfr3-xj75-pfwh","id":"tcs_01M5N93JE41GPNKADFJXTP63RP","modified_at":"2026-06-25T21:41:30.149913Z","published_at":"2026-06-25T21:22:52Z","references":["https://osv.dev/vulnerability/GHSA-wfr3-xj75-pfwh","https://github.com/MessagePack-CSharp/MessagePack-CSharp/security/advisories/GHSA-wfr3-xj75-pfwh","https://nvd.nist.gov/vuln/detail/CVE-2026-48513","https://github.com/MessagePack-CSharp/MessagePack-CSharp"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-wfr3-xj75-pfwh","url":"https://osv.dev/vulnerability/GHSA-wfr3-xj75-pfwh"},{"source":"nvd","source_id":"CVE-2026-48513","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48513"}],"summary":"MessagePack-CSharp: DynamicUnionResolver-generated deserializers miss depth enforcement"}