Vulnerability in A2aproject A2a-Java
CVE-2026-90819
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.
Vulnerability class: CRLF Injection
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.007 (51.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- A2aproject A2a-Java — versions 1.2.0
Weakness classification (CWE)
References
- vuldb.com/vuln/403322 (technical-description, vdb-entry)
- vuldb.com/vuln/403322/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-90819 (third-party-advisory)
- vuldb.com/submit/922996 (third-party-advisory)
- github.com/a2aproject/a2a-java/pull/1043 (issue-tracking, patch)
- github.com/a2aproject/a2a-java/pull/1053 (issue-tracking, patch)
- github.com/a2aproject/a2a-java/commit/247a655043f145f6f8e3853724b6a543eaa02001 (patch)
- github.com/a2aproject/a2a-java/releases/tag/v1.3.0.Final (patch)
- github.com/a2aproject/a2a-java/ (product)
Frequently asked questions
- What is CVE-2026-90819?
- CVE-2026-90819 is a high-severity vulnerability in A2aproject A2a-Java, classified under CRLF Injection. CVSS score: 7.3/10. Published 2026-09-14.
- How severe is CVE-2026-90819?
- High severity. CVSS v3 base score is 7.3 out of 10.