CVE-2026-90819 Details
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.
A vulnerability allowing HTTP response splitting has been identified in the A2A Project A2A-Java library, specifically in version 1.2.0. The issue arises in the BasePushNotificationSender.dispatchNotification method, where the Authorization header is not properly validated, allowing for the injection of CRLF characters. This vulnerability can be exploited remotely by sending a push notification that includes a malformed Authorization token.
Users are advised to upgrade to A2A-Java version 1.3.0 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 14, 2026CISA-ADP
Assessed Sep 15, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/a2aproject/a2a-java/ | [email protected] | Vendor |
| https://github.com/a2aproject/a2a-java/commit/247a655043f145f6f8e3853724b6a543eaa02001 | [email protected] | Source CodeVendor |
| https://github.com/a2aproject/a2a-java/pull/1043 | [email protected] | Issue TrackingVendor |
| https://github.com/a2aproject/a2a-java/pull/1053 | [email protected] | Issue TrackingVendor |
| https://github.com/a2aproject/a2a-java/releases/tag/v1.3.0.Final | [email protected] | Release NotesVendor |
| https://vuldb.com/cve/CVE-2026-90819 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/922996 | [email protected] | Issue TrackingPermission Required |
| https://vuldb.com/vuln/403322 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/403322/cti | [email protected] | Content Wall |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-113 | Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') | [email protected] |
| CWE-93 | Improper Neutralization of CRLF Sequences ('CRLF Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| a2aproject a2a-java | 1.2.0 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 15, 2026 | CVE Modified | CISA-ADP |
| Sep 14, 2026 | New CVE Received | [email protected] |