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SCA: security update for org.a2aproject.sdk:a2a-java-sdk-server-common (GHSA-q78c-5jjq-57g8)

medium Tenable Cloud Security Plugin ID 476413

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - A2A Java SDK is the official Java SDK for the Agent2Agent (A2A) Protocol. Prior to 1.3.0.Final,
 BasePushNotificationSender in server-common sends task data to the URL in TaskPushNotificationConfig
 without destination validation, scheme restrictions, or bounds on redirects.
 InMemoryPushNotificationConfigStore.setInfo stores the URL verbatim, and
 onCreateTaskPushNotificationConfig does not validate the destination. In the default deployment with push
 notifications enabled, an unauthenticated caller can register a destination through an inline SendMessage
 configuration or CreateTaskPushNotificationConfig for an existing task, causing task status and artifact
 updates to send requests from the server's network position to loopback, private, link-local cloud-
 metadata, IPv6 unique-local, unspecified, or multicast destinations where routing permits.
 JdkA2AHttpClient and VertxA2AHttpClient follow redirects, allowing a webhook redirect to bypass creation-
 time destination checks and convert a POST into a GET; hostname-only checks also do not prevent DNS
 rebinding. Direct POST delivery can push attacker-influenced task data into internal services, whereas a
 redirected POST-to-GET request drops the body. The sender discards the fetched response and does not
 expose delivery success or failure, so the demonstrated behavior does not provide response read-back. No
 credentials or user interaction are required. This issue is fixed in version 1.3.0.Final.
 (CVE-2026-111761)

Solution

Update the org.a2aproject.sdk:a2a-java-sdk-server-common library and its related packages to version 1.3.0.Final or later.

See Also

https://github.com/advisories/GHSA-q78c-5jjq-57g8

Plugin Details

Severity: Medium

ID: 476413

Version: Revision 1.1

Type: Local

Family: SCA Checks

Published: 10/21/2026

Updated: 10/21/2026

Risk Information

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2026-111761

CVSS v3

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 5.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 10/20/2026

Vulnerability Publication Date: 10/20/2026

Reference Information

CVE: CVE-2026-111761

cwe: CWE-918