Ion Java StackOverflow vulnerability

Answer in brief

CVE-2024-21634 records a High severity (CVSS 7.5) vulnerability in Ion Java StackOverflow vulnerability. The current sources do not mark it as known exploited. The current feed maps com.amazon.ion:ion-java (maven), software.amazon.ion:ion-java (maven). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jan 3, 2024Updated Sep 10, 2026Source checked Sep 10, 2026First seen by HOL Sep 10, 2026Material review Sep 10, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps com.amazon.ion:ion-java (maven), software.amazon.ion:ion-java (maven). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
com.amazon.ion:ion-javamaven	>=0 <1.10.5	1.10.5
software.amazon.ion:ion-javamaven	>=0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for com.amazon.ion:ion-java, software.amazon.ion:ion-java.
Review the reported fix. Update com.amazon.ion:ion-java to 1.10.5 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jan 3, 2024
Evidence: source:osv:source_dates:source-dates:record
Source modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:record
First seen by HOL
Sep 10, 2026

Sources and claim methodology

Upstream source description

### Impact 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. Impacted versions: <1.10.5 ### Patches The patch is included in `ion-java` >= 1.10.5. ### Workarounds Do not load data which originated from an untrusted source or that could have been tampered with. **Only load data you trust.** ---- If you have any questions or comments about this advisory, we ask that you contact AWS/Amazon Security via our vulnerability reporting page [1] or directly via email to [[email protected]](mailto:[email protected]). Please do not create a public GitHub issue. [1] https://aws.amazon.com/security/vulnerability-reporting

Quoted source text, attributed separately from HOL analysis.