NuGet/MessagePack CVE-2026-48509: critical 9.1, EPSS 0.42%
MessagePack-CSharp: ASP.NET Core MessagePackInputFormatter defaults to TrustedData for HTTP request bodies
Action: Upgrade MessagePack to 2.5.301 (2.x) or 3.1.7 (3.x) or later.
Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 2.5.301 | - |
| 3.0 | 3.1.7 | - |
Fixed versions
| 2.5.301 | 3.1.7 |
Sources
- osv: GHSA-2f33-pr97-265q
- nvd: CVE-2026-48509
- https://github.com/MessagePack-CSharp/MessagePack-CSharp/security/advisories/GHSA-2f33-pr97-265q
- https://github.com/MessagePack-CSharp/MessagePack-CSharp
CVE-2026-48509 · published · modified · JSON