CVE-2026-90819 (CVSS 7.3)

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.

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CVSS v3.1 Score

7.3

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

EPSS — Exploit Prediction

0.0039

Probability of exploitation

0.32%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-93 CWE-93

CWE-113 CWE-113

References

Other References

https://github.com/a2aproject/a2a-java/ https://github.com/a2aproject/a2a-java/commit/247a655043f145f6f8e3853724b6a543eaa02001 https://github.com/a2aproject/a2a-java/pull/1043 https://github.com/a2aproject/a2a-java/pull/1053 https://github.com/a2aproject/a2a-java/releases/tag/v1.3.0.Final https://vuldb.com/cve/CVE-2026-90819 https://vuldb.com/submit/922996 https://vuldb.com/vuln/403322 https://vuldb.com/vuln/403322/cti

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.3 (HIGH).

How severe is CVE-2026-90819? +

CVE-2026-90819 has a CVSS v3.1 score of 7.3 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0039, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-90819? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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