# Ion Java StackOverflow vulnerability

Advisory record · `GHSA-264p-99wq-f4j6`

- **Identifiers:** `GHSA-264p-99wq-f4j6` · `CVE-2024-21634`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-770](https://cwe.mitre.org/data/definitions/770.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 3 Jan 2024
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 3 Jan 2024, 22:04 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `com.amazon.ion:ion-java` (Maven): affected `<1.10.5`; fixed in `1.10.5`
- `software.amazon.ion:ion-java` (Maven): affected `all versions`; no fixed version yet

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Ion Java (com.amazon.ion:ion-java) versions before 1.10.5 are vulnerable to a denial-of-service issue. An attacker who can supply crafted Ion text or binary data that an application deserializes, or processes through the IonValue model, can trigger a StackOverflowError. Upgrade com.amazon.ion:ion-java to 1.10.5 or later; until then, only load Ion data from trusted sources. The software.amazon.ion:ion-java package has no fixed version listed.

Written 2 Nov 2026.

## 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 CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0083, the 58th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:18 UTC: First seen by agentprime
- 31 Oct 2026, 14:18 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-264p-99wq-f4j6)

## Sources

- [GitHub Advisory Database: GHSA-264p-99wq-f4j6](https://github.com/advisories/GHSA-264p-99wq-f4j6)
- [OSV: GHSA-264p-99wq-f4j6](https://osv.dev/vulnerability/GHSA-264p-99wq-f4j6)
- <https://github.com/amazon-ion/ion-java/security/advisories/GHSA-264p-99wq-f4j6>
- <https://nvd.nist.gov/vuln/detail/CVE-2024-21634>
- <https://github.com/amazon-ion/ion-java>
- <https://security.netapp.com/advisory/ntap-20241108-0002>

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-264p-99wq-f4j6>, 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-264p-99wq-f4j6/>. Everything for agents: <https://agentprime.io/llms.txt>.