Advisoriesby IbisMicrosoftCVE-2026-50649
Microsoft .NET 8.0 runtime: unsafe deserialization
Fix: upgrade to 8.0.29 or later (10 fixed versions below)
Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code locally.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| .NET 8.0 runtime Product | >= 8.0.0, < 8.0.29 | 8.0.29 |
| .NET 9.0 runtime Product | >= 9.0.0, < 9.0.18 | 9.0.18 |
| Microsoft .NET Framework 3.5 Product | >= 3.5.0, < 2.0.50727.9182 & 3.0.30729.9168 | 2.0.50727.9182 & 3.0.30729.9168 |
| Microsoft .NET Framework 3.5 AND 4.7.2 Product | >= 4.7.0, < 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0 | 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0 |
| Microsoft .NET Framework 3.5 AND 4.8 Product | >= 4.8.0, < 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0 | 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0 |
| Microsoft .NET Framework 3.5 AND 4.8.1 Product | >= 4.8.1, < 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 | 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 |
| Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 Product | >= 4.7.0, < 4.7.4143.0 | 4.7.4143.0 |
| Microsoft .NET Framework 4.8 Product | >= 4.8.0, < 4.8.4803.0 | 4.8.4803.0 |
| Microsoft .NET Framework 4.8.1 Product | >= 4.8.0.0, < 4.8.9340.0 | 4.8.9340.0 |
| Microsoft Visual Studio 2026 version 18.7 Product | >= 18.0, < 18.7.4 | 18.7.4 |
Changes since it was listed
Fixed in: .NET 8.0 8.0.29, .NET 9.0 9.0.18, Microsoft .NET Framework 3.5 2.0.50727.9182 & 3.0.30729.9168 to .NET 8.0 runtime 8.0.29, .NET 9.0 runtime 9.0.18, Microsoft .NET Framework 3.5 2.0.50727.9182 & 3.0.30729.9168
Details and references
- CVSS 3.1
- CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-502