CVE-2026-90790: a2aproject a2a-Python

Medium severity, CVSS 6.3. EPSS: 0.4% chance of exploitation in the next 30 days.

A security vulnerability has been detected in a2aproject a2a-python up to 1.1.3. This affects the function _dispatch_notification of the file src/a2a/server/tasks/base_push_notification_sender.py of the component Push Notification Sender. The manipulation of the argument push_info.url leads to server-side request forgery. Remote exploitation of the attack is possible. Upgrading to version 1.1.4 is able to mitigate this issue. It is suggested to upgrade the affected component.

Affected products

• a2aproject a2a-Python: version 1.1.0 only; version 1.1.1 only; version 1.1.2 only; version 1.1.3 only

Published 2026-09-14. Last modified 2026-09-15.