CVE-2026-90790 Server-side request forgery in a2a-python
Attackers can exploit a server-side request forgery vulnerability in the a2a-python library's push notification sender to access internal resources.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-90790?
CVE-2026-90790 is a medium-severity server-side request forgery vulnerability in a2aproject a2a-python, published on 14 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-918
Which versions are affected by CVE-2026-90790?
How do I fix CVE-2026-90790?
No fix has been published for CVE-2026-90790 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-90790 being exploited?
There is no known exploitation of CVE-2026-90790 in the wild and no public exploit code.
Sources
Also known as GHSA-33c5-chm5-2ggp.