Newtonsoft.Json before version 13.0.1 is affected by a mishandling of exceptional conditions vulnerability. Crafted data that is passed to the JsonConvert.DeserializeObject method may trigger a StackOverflow exception resulting in denial of service. Depending on the usage of the library, an unauthenticated and remote attacker may be able to cause the denial of service condition.

Affected: NuGet: Newtonsoft.Json

Newtonsoft.Json prior to version 13.0.1 is vulnerable to Insecure Defaults due to improper handling of expressions with high nesting level that lead to StackOverFlow exception or high CPU and RAM usage. Exploiting this vulnerability results in Denial Of Service (DoS).

The serialization and deserialization path have different properties regarding the issue.

Deserializing methods (like `JsonConvert.DeserializeObject`) will process the input that results in burning the CPU, allocating memory, and consuming a thread of execution. Quite high nesting level (>10kk, or 9.5MB of `{a:{a:{...` input) is needed to achieve the latency over 10 seconds, depending on the hardware.

Serializing methods (like `JsonConvert.Serialize` or `JObject.ToString`) will throw StackOverFlow exception with the nesting level of around 20k.

To mitigate the issue one either need to update Newtonsoft.Json to 13.0.1 or set `MaxDepth` parameter in the `JsonSerializerSettings`. This can be done globally with the following statement. After that the parsing of the nested input will fail fast with `Newtonsoft.Json.JsonReaderException`:

``` JsonConvert.DefaultSettings = () => new JsonSerializerSettings { MaxDepth = 128 }; ```

Repro code: ``` //Create a string representation of an highly nested object (JSON serialized) int nRep = 25000; string json = string.Concat(Enumerable.Repeat("{a:", nRep)) + "1" + string.Concat(Enumerable.Repeat("}", nRep));

//Parse this object (leads to high CPU/RAM consumption) var…

Affected: Ubuntu:16.04:LTS: newtonsoft-json, Ubuntu:18.04:LTS: newtonsoft-json, Ubuntu:20.04:LTS: newtonsoft-json, Ubuntu:22.04:LTS: newtonsoft-json, Ubuntu:24.04:LTS: newtonsoft-json

Newtonsoft.Json before version 13.0.1 is affected by a mishandling of exceptional conditions vulnerability. Crafted data that is passed to the JsonConvert.DeserializeObject method may trigger a StackOverflow exception resulting in denial of service. Depending on the usage of the library, an unauthenticated and remote attacker may be able to cause the denial of service condition.

Ein Angreifer kann mehrere Schwachstellen in Microsoft SQL Server ausnutzen, um seine Privilegien zu erhöhen, um Informationen offenzulegen, und um nicht näher spezifizierte Auswirkungen zu verursachen.