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High severity · published Sep 14, 2026
CVE-2026-90819
a2aproject a2a-java Authorization Header Construction BasePushNotificationSender.java BasePushNotificationSender.dispatchNotification response splitting
7.3
CVSS
0.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 51% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
A2
a2a-java · a2aproject
1.2.0 · source: vendor
Affected product
A2
a2a-java
a2aproject
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-90819
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-90819
github.com
https://github.com/a2aproject/a2a-java/
github.com
https://github.com/a2aproject/a2a-java/commit/247a655043f145f6f8e3853724b6a543eaa02001
github.com
https://github.com/a2aproject/a2a-java/pull/1043
github.com
https://github.com/a2aproject/a2a-java/pull/1053
github.com
https://github.com/a2aproject/a2a-java/releases/tag/v1.3.0.Final
vuldb.com
https://vuldb.com/cve/CVE-2026-90819
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