What’s Vulnerable › Vulnerabilities

CVE-2026-90819: a2aproject a2a-java Authorization Header Construction BasePushNotificationSender.java BasePushNotificationSender.dispatchNotification response splitting

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-14 · updated 2026-09-15
• Weakness: CWE-93

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.

Affected products

• a2aproject a2a-java: 1.2.0

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

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