# Improper Handling of Exceptional Conditions in Newtonsoft.Json

Advisory record · `GHSA-5crp-9r3c-p9vr`

- **Identifiers:** `GHSA-5crp-9r3c-p9vr` · `CVE-2024-21907`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** Yes: CVSS 7+ and EPSS
- **Weakness (CWE):** [CWE-755](https://cwe.mitre.org/data/definitions/755.html)
- **Tags:** [CWE-755](https://agentprime.io/advisories/tag/cwe-755.md)
- **Published:** 22 Jun 2022
- **Updated:** 8 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 22 Jun 2022, 15:08 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 7.5 (7.0 or more) and EPSS 0.33 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `Newtonsoft.Json` (NuGet): affected `<13.0.1`; fixed in `13.0.1`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.33, the 98th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:22 UTC: First seen by agentprime
- 31 Oct 2026, 15:22 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-5crp-9r3c-p9vr)

## Sources

- [GitHub Advisory Database: GHSA-5crp-9r3c-p9vr](https://github.com/advisories/GHSA-5crp-9r3c-p9vr)
- [OSV: GHSA-5crp-9r3c-p9vr](https://osv.dev/vulnerability/GHSA-5crp-9r3c-p9vr)
- <https://github.com/JamesNK/Newtonsoft.Json/issues/2457>
- <https://github.com/JamesNK/Newtonsoft.Json/pull/2462>
- <https://github.com/JamesNK/Newtonsoft.Json/commit/7e77bbe1beccceac4fc7b174b53abfefac278b66>
- <https://alephsecurity.com/2018/10/22/StackOverflowException>
- <https://alephsecurity.com/vulns/aleph-2018004>
- <https://github.com/JamesNK/Newtonsoft.Json>
- <https://security.snyk.io/vuln/SNYK-DOTNET-NEWTONSOFTJSON-2774678>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-5crp-9r3c-p9vr>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-5crp-9r3c-p9vr/>. Everything for agents: <https://agentprime.io/llms.txt>.