# CVE-2026-117505: a2a-java resource consumption in ChildQueue

Source: https://junglewise.ai/threats/cve-2026-117505-a-security-flaw-has-been-discovered-in-a2aproject-a2a-java-up-to  
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-2026-117505 · Severity: medium · CVSS 4.3 · Published 2026-10-27

The a2a-java library, which provides an Agent-to-Agent messaging SDK for Java applications, contains a resource consumption vulnerability in its event queue handling. An attacker with network access can send specially crafted requests that exhaust system resources, potentially causing the application to become unresponsive or crash.

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

## Quick answers

**Is CVE-2026-117505 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-117505 being exploited in the wild.

**How severe is CVE-2026-117505?** 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-2026-117505?** 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-2026-117505 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-117505?** 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 queue.offer function of the ChildQueue component, allowing remote manipulation that leads to uncontrolled resource consumption. The attack vector is network-based with no authentication requirement. A fix is available in version 1.3.0.Final.

## Affected products

- a2aproject a2a-java up to 1.2.0.Final

## Timeline

- 2026-10-27: disclosed
- 2026-08-11: patched

## References

- [https://github.com/a2aproject/a2a-java/](https://github.com/a2aproject/a2a-java/)
- [https://github.com/a2aproject/a2a-java/commit/be663f806efcfdddd2805d214fae4998379ac5f2](https://github.com/a2aproject/a2a-java/commit/be663f806efcfdddd2805d214fae4998379ac5f2)

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