# CVE-2026-117506: a2aproject a2a-java resource exhaustion in push notification config store

Source: https://junglewise.ai/threats/cve-2026-117506-a-weakness-has-been-identified-in-a2aproject-a2a-java-up-to-1-2  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-27. Updated: 2026-10-27  
License: CC BY 4.0 with a link back

CVE-2026-117506 · Severity: medium · CVSS 4.3 · Published 2026-10-27

a2a-java is a Java SDK for the Agent2Agent protocol used in distributed agent systems. A flaw in its push notification configuration storage component allows remote attackers to trigger excessive resource consumption by repeatedly manipulating push notification configurations, potentially causing denial of service. Upgrading to version 1.3.0.Final resolves this issue.

Technologies: [A2aproject A2a-Java](https://junglewise.ai/threats/technologies/a2a-java). Vendors: [A2aproject](https://junglewise.ai/threats/vendors/a2aproject).

## Quick answers

**Is CVE-2026-117506 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-117506 being exploited in the wild.

**How severe is CVE-2026-117506?** Medium severity, with a CVSS score of 4.3, published 27 October 2026.

**Which products and versions are affected?** A2aproject A2a-Java up to 1.2.0.Final.

**Is there a fix for CVE-2026-117506?** Yes: fixed in 1.3.0.Final. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-117506 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-117506?** Check whether you run A2aproject A2a-Java at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 1.3.0.Final

## Technical details

The vulnerability exists in the InMemoryPushNotificationConfigStore and JpaDatabasePushNotificationConfigStore components, where a missing per-task push notification configuration limit allows attackers to add unlimited configurations via the setInfo function. This leads to unbounded memory consumption and resource exhaustion. The fix enforces a configurable limit (default 100 configs per task) to prevent this attack.

## Affected products

- a2aproject a2a-java up to 1.2.0.Final

## Timeline

- 2026-10-27: disclosed
- 2026-08-12: patched: Fix commit b478810a03b4a16841d36aca5c6e87d8f48fce67

## References

- [https://github.com/a2aproject/a2a-java/](https://github.com/a2aproject/a2a-java/)
- [https://github.com/a2aproject/a2a-java/commit/b478810a03b4a16841d36aca5c6e87d8f48fce67](https://github.com/a2aproject/a2a-java/commit/b478810a03b4a16841d36aca5c6e87d8f48fce67)

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