CVE-2026-116476 a2aproject CVE debrief

Who should care

Defenders responsible for a2aproject a2a-dotnet deployments should assess exposure and verify the affected version. They should prioritize verifying the affected version and assessing exposure, as the vulnerability allows for a race condition through remote manipulation.

Why it matters

Defenders should prioritize verifying the affected version and assessing exposure, as the vulnerability allows for a race condition through remote manipulation.

• Verify the version of a2aproject a2a-dotnet and assess exposure
• Review the TaskProjection.ApplyStatus function for potential vulnerabilities
• Monitor for potential remote manipulations

Technical summary

A weakness has been identified in a2aproject a2a-dotnet up to 1.0.0-preview3. The affected element is the function TaskProjection.ApplyStatus of the component TaskProjection. Executing a manipulation can lead to race condition. The attack may be performed from remote. The pull request to fix this issue awaits acceptance. Defenders should prioritize verifying the affected version and assessing exposure, as the vulnerability allows for a race condition through remote manipulation. The vulnerability impacts defenders responsible for a2aproject a2a-dotnet deployments.

Defensive priority

Defenders should prioritize verifying the affected version and assessing exposure, as the vulnerability allows for a race condition through remote manipulation.

Recommended defensive actions

• Verify the version of a2aproject a2a-dotnet and assess exposure
• Review the TaskProjection.ApplyStatus function for potential vulnerabilities
• Monitor for potential remote manipulations
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review compensating controls for exposed systems while remediation is scheduled and verified

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected component. The vulnerability has been identified in a2aproject a2a-dotnet up to 1.0.0-preview3, and defenders should verify the affected version and assess exposure. The CVE record was published on 2026-10-26T19:16:30.587Z and has not been modified since then. The NVD entry provides additional information on the vulnerability, including its CVSS score and affected component.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.