EUVD-2026-78085
GHSA-wwww-x39f-grjc
Severity by source
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Requires authenticated client access to register push notification config (PR:L); header injection yields limited C/I impact with no availability effect.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
HTTP response splitting in a2a-java 1.2.0 allows attackers who control push notification authentication credentials to inject arbitrary HTTP headers by embedding CR/LF characters in the Authorization header assembled by BasePushNotificationSender.dispatchNotification(). The root cause is direct concatenation of client-supplied scheme and credentials fields into an outbound HTTP header without CRLF sanitization. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to control the `scheme` or `credentials` field of an `AuthenticationInfo` object stored in a `TaskPushNotificationConfig` that is subsequently processed by `BasePushNotificationSender.dispatchNotification()`. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 6.9 with PR:N appears overstated: exploitation requires the attacker to control the `scheme` or `credentials` fields within a registered `TaskPushNotificationConfig`, which in practice means the attacker must be an authenticated participant in the A2A session capable of submitting push notification configurations. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to a2a-java v1.3.0.Final, available at https://github.com/a2aproject/a2a-java/releases/tag/v1.3.0.Final. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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