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.
https://www.theregister.com/2025/09/10/microsoft_patch_tuesday/
https://www.infosecurity-magazine.com/news/two-zero-days-patch-tuesday-cves/
https://thehackernews.com/2025/09/microsoft-fixes-80-flaws-including-smb.html
https://security.snyk.io/vuln/SNYK-DOTNET-NEWTONSOFTJSON-2774678
https://github.com/JamesNK/Newtonsoft.Json/pull/2462
https://github.com/JamesNK/Newtonsoft.Json/issues/2457
https://github.com/JamesNK/Newtonsoft.Json/commit/7e77bbe1beccceac4fc7b174b53abfefac278b66
https://alephsecurity.com/vulns/aleph-2018004
https://alephsecurity.com/2018/10/22/StackOverflowException/