CVE-2024-30105: .NET Denial of Service Vulnerability in System.Text.Json
Summary
CVE-2024-30105: Microsoft Security Advisory CVE-2024-30105 | .NET Denial of Service Vulnerability. Affects System.Text.Json versions >= 7.0.0, < 8.0.4. Fixed in 8.0.4. How to fix ↓
Also tracked for
- dotnet · Bitnami
- dotnet-sdk · Bitnami
The same CVE-2024-30105 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.
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Background
System.Text.Json is a package in the .NET ecosystem that provides high-performance, low-allocating JSON APIs for processing JSON data. It is widely used in .NET applications for serialization and deserialization of JSON objects. However, a vulnerability has been discovered in versions 4.6.0-preview6.19259.10 to 8.0.3 of System.Text.Json, which can lead to a Denial of Service (DoS) attack.
Vulnerability Detail
The vulnerability arises when the JsonSerializer.DeserializeAsyncEnumerable method is used with untrusted input. This can be exploited by an attacker to cause a DoS condition in the affected .NET application. By providing specially crafted input, the attacker can trigger excessive resource consumption, leading to unresponsiveness or crashes in the application.
How To Fix
Latest published version: 10.0.13 as of 23 Oct 2026
Upgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.
If you need the minimum change
8.0.4
This is the first release that contains the fix.
Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There is no known workaround for this vulnerability. Updating to the latest version of .NET is the recommended solution.
Conclusion
In conclusion, the System.Text.Json package in .NET versions 4.6.0-preview6.19259.10 to 8.0.3 is vulnerable to a Denial of Service attack. It is crucial to update to the latest version of .NET to mitigate this vulnerability. No known workaround exists, and the recommended solution is to install the updated runtime or SDK and restart the affected applications. Microsoft provides a bounty program for reporting security issues.
See every vulnerability recorded for System.Text.Json →
FAQ
If you have a runtime or SDK with a version listed in the affected software or affected packages section, you are exposed to the vulnerability.
You can use Vulert's playground (https://vulert.com/scanner) to check if your application is affected by this vulnerability. Vulert monitors and alerts in real-time for open-source vulnerabilities without requiring access to the code or installation.
Microsoft has not identified any mitigating factors for this vulnerability.
Exploiting this vulnerability can lead to a Denial of Service condition in the affected .NET application, causing unresponsiveness or crashes.
Yes, Microsoft offers a .NET Core & .NET 5 Bounty Program. If you find a potential security issue, you can report it to secure@microsoft.com. Details of the bounty program can be found at https://aka.ms/corebounty.
Related vulnerabilities
Recent vulnerabilities recorded for System.Text.Json.
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