# CVE-2022-23459: Double free or Use after Free in Value class of Jsonxx

> A double free or use-after-free vulnerability in the Jsonxx C++ library allows attackers to cause memory corruption, potentially leading to code execution or crashes.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Aug 2022
- **Updated:** 23 Apr 2025
- **Also known as:** GHSA-8662-6hf9-cr47

## What is CVE-2022-23459?

CVE-2022-23459 is a high-severity use after free vulnerability in hjiang Jsonxx, published on 19 Aug 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Jsonxx or Json++ is a JSON parser, writer and reader written in C++. In affected versions of jsonxx use of the Value class may lead to memory corruption via a double free or via a use after free. The value class has a default assignment operator which may be used with pointer types which may point to alterable data where the pointer itself is not updated. This issue exists on the current commit of the jsonxx project. The project itself has been archived and updates are not expected. Users are advised to find a replacement.

Weakness: CWE-416 (Use After Free), CWE-415 (Double Free)

## Which versions are affected by CVE-2022-23459?

It affects 1 product.


Products: Hjiang Json\+\+.

## How do I fix CVE-2022-23459?

No fix has been published for CVE-2022-23459 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-23459 being exploited?

There is no known exploitation of CVE-2022-23459 in the wild and no public exploit code.

## Other vulnerabilities in hjiang Jsonxx

- [CVE-2022-23460](https://insights.sbomify.com/CVE-2022-23460/): Stack overflow in Jsonxx (medium 5.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-23459 and fix it if it is affected.

What it is: CVE-2022-23459 is a high-severity use after free vulnerability in hjiang Jsonxx, published on 19 Aug 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-23459 in the wild and no public exploit code.

Affected product: hjiang Jsonxx. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2022-23459/ (Markdown: https://insights.sbomify.com/CVE-2022-23459/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-23459
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-23459
- OSV: https://osv.dev/vulnerability/CVE-2022-23459

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-23459/
Summaries are generated and may contain mistakes; the official description above is the record.