# CVE-2024-21634: Ion Java StackOverflow vulnerability

> Crafted Ion data causes a StackOverflowError in the ion-java library, leading to denial of service for applications processing untrusted input.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 3 Jan 2024
- **Updated:** 3 Nov 2025
- **Also known as:** CLEANSTART-2026-GM84692, CLEANSTART-2026-NE90123, ECHO-4efd-f0e1-ea28, GHSA-264p-99wq-f4j6, MINI-hpcx-88x5-775r, ROOT-APP-MAVEN-CVE-2024-21634

## What is CVE-2024-21634?

CVE-2024-21634 is a high-severity denial of service vulnerability in amazon-ion ion-java, published on 3 Jan 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Amazon Ion is a Java implementation of the Ion data notation. Prior to version 1.10.5, a potential denial-of-service issue exists in `ion-java` for applications that use `ion-java` to deserialize Ion text encoded data, or deserialize Ion text or binary encoded data into the `IonValue` model and then invoke certain `IonValue` methods on that in-memory representation. An actor could craft Ion data that, when loaded by the affected application and/or processed using the `IonValue` model, results in a `StackOverflowError` originating from the `ion-java` library. The patch is included in `ion-java` 1.10.5. As a workaround, do not load data which originated from an untrusted source or that could have been tampered with.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2024-21634?

4 open source packages ship an affected version, including com.amazon.ion:ion-java and software.amazon.ion:ion-java. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `com.amazon.ion:ion-java` | Maven | All versions | 1.10.5 |
| `com.amazon.ion:ion-java` | Maven | All versions | 1.10.5 |
| `software.amazon.ion:ion-java` | Maven | All versions | None |
| `software.amazon.ion:ion-java` | Maven | All versions | None |

Products: Amazon Ion.

## How do I fix CVE-2024-21634?

Upgrade com.amazon.ion:ion-java to 1.10.5 or later.

## Is CVE-2024-21634 being exploited?

There is no known exploitation of CVE-2024-21634 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-21634 and fix it if it is affected.

What it is: CVE-2024-21634 is a high-severity denial of service vulnerability in amazon-ion ion-java, published on 3 Jan 2024. 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-2024-21634 in the wild and no public exploit code.

Affected packages and fixed versions:
- com.amazon.ion:ion-java (Maven): affected all versions; fixed in 1.10.5
- com.amazon.ion:ion-java (Maven): affected all versions; fixed in 1.10.5
- software.amazon.ion:ion-java (Maven): affected all versions; no fix listed
- software.amazon.ion:ion-java (Maven): affected all versions; no fix listed

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-2024-21634/ (Markdown: https://insights.sbomify.com/CVE-2024-21634/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-21634
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-21634
- OSV: https://osv.dev/vulnerability/CVE-2024-21634

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-21634/
Summaries are generated and may contain mistakes; the official description above is the record.