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CVE-2026-90819: HTTP Response Splitting in a2aproject a2a-java

0
Medium
VulnerabilityCVE-2026-90819cvecve-2026-90819gcveosvghsa-wwww-x39f-grjcghsa
Published: 09/14/2026 (09/14/2026, 21:31:56 UTC)
Source: CVE Database V5
Vendor/Project: a2aproject
Product: a2a-java

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 v4.0

Score 6.9medium

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Vuln. Confidentiality
Low
Vuln. Integrity
Low
Vuln. Availability
Low
Subsq. Confidentiality
None
Subsq. Integrity
None
Subsq. Availability
None
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X

Affected software

a2aproject

a2a-java

Affected versions
=1.2.0
CPE configurations
cpe:2.3:a:a2aproject:a2a-java:*:*:*:*:*:*:*:*

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 09/14/2026, 21:03:00 UTC

Technical Analysis

The vulnerability CVE-2026-90819 affects a2aproject a2a-java version 1.2.0 in the function BasePushNotificationSender.dispatchNotification within the Authorization Header Construction component. It allows an attacker to perform HTTP response splitting by manipulating the HTTP response headers. This can be triggered remotely without authentication. The issue is resolved by upgrading to version 1.3.0, which includes a patch identified by commit 247a655043f145f6f8e3853724b6a543eaa02001.

Potential Impact

An attacker can remotely exploit this vulnerability to perform HTTP response splitting, which may lead to web cache poisoning, cross-site scripting, or other HTTP header injection attacks. The CVSS 4.0 base score is 6.9 (medium severity), indicating a significant but not critical risk.

Mitigation Recommendations

Upgrade the a2aproject a2a-java component from version 1.2.0 to version 1.3.0 to apply the official fix. No other mitigation steps are indicated or required.

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Technical Details

Data Version
5.2
Assigner Short Name
VulDB
Date Reserved
2026-09-13T19:01:37.271Z
Cvss Version
4.0
State
PUBLISHED

Threat ID: 6aa85d5755bf5e2cf598a1d3

Added to database: 09/14/2026, 20:47:19 UTC

Last enriched: 09/14/2026, 21:03:00 UTC

Last updated: 09/15/2026, 03:19:14 UTC

Views: 5

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