CVE-2026-90819 A weakness has been identified in a2aproject a2a-java 1.2.0.

Medium 6.9 Published 14 Sep 2026 Updated 15 Sep 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-90819?

CVE-2026-90819 is a medium-severity vulnerability in a2aproject a2a-java, published on 14 Sep 2026.

Official description

A weakness has been identified in a2aproject a2a-java 1.2.0. The affected element is the function BasePushNotificationSender.dispatchNotification of the file server-common/src/main/java/org/a2aproject/sdk/server/tasks/BasePushNotificationSender.java of the component Authorization Header Construction. This manipulation causes http response splitting. The attack can be initiated remotely. Upgrading to version 1.3.0 is sufficient to fix this issue. Patch name: 247a655043f145f6f8e3853724b6a543eaa02001. You should upgrade the affected component.

Weakness: CWE-93, CWE-113

Which versions are affected by CVE-2026-90819?

How do I fix CVE-2026-90819?

No fix has been published for CVE-2026-90819 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-90819 being exploited?

There is no known exploitation of CVE-2026-90819 in the wild and no public exploit code.

Sources

Also known as GHSA-wwww-x39f-grjc.