{"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-2026-48510"],"ecosystem":"NuGet","epss":0.00405,"exploited":false,"fixed_versions":["2.5.301","3.1.7"],"ghsa_id":"GHSA-v72x-2h86-7f8m","id":"tcs_01M5N9155JM3JDH106ETEF6MS9","modified_at":"2026-06-25T19:11:29.577707Z","published_at":"2026-06-25T18:53:44Z","references":["https://osv.dev/vulnerability/GHSA-v72x-2h86-7f8m","https://github.com/MessagePack-CSharp/MessagePack-CSharp/security/advisories/GHSA-v72x-2h86-7f8m","https://nvd.nist.gov/vuln/detail/CVE-2026-48510","https://github.com/MessagePack-CSharp/MessagePack-CSharp"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-v72x-2h86-7f8m","url":"https://osv.dev/vulnerability/GHSA-v72x-2h86-7f8m"}],"summary":"MessagePack-CSharp: LZ4 decompression allocates from unbounded declared output lengths"}