CVE-2026-90790 a2aproject a2a-python Push Notification Sender base_push_notification_sender.py _dispatch_notification server-side request forgery

A security vulnerability has been detected in a2aproject a2a-python up to 1.1.3. This affects the function dispatchnotification of the file src/a2a/server/tasks/basepushnotificationsender.py of the component Push Notification Sender. The manipulation of the argument pushinfo.url leads to...