CVE-2026-90819
Published:September 14, 2026
Updated:October 13, 2026
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.
Affected Packages
https://github.com/a2aproject/a2a-java.git (GITHUB):
Affected version(s) >=v0.3.0.Beta2 <v1.3.0.FinalFix Suggestion:
Update to version v1.3.0.Finalorg.a2aproject.sdk:a2a-java-sdk-server-common (JAVA):
Affected version(s) >=1.0.0.Alpha4 <1.3.0.FinalFix Suggestion:
Update to version 1.3.0.FinalRelated Resources (11)
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Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
Exploit Maturity
NOT DEFINED
CVSS v3
Base Score:
7.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW
Exploit Maturity
NOT DEFINED
Weakness Type (CWE)
EPSS
Base Score:
0.66