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CVE-2026-111762— A2A Java SDK: Push notification credentials logged in cleartext on protobuf parse failure

Quick assessment

Affected
a2aproject a2a-java
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

A2A Java SDK 是 Agent2Agent (A2A) 协议的官方 Java SDK。在 1.3.0.Final 版本之前， 文件中的 方法会在 抛出 异常时，以 SEVERE（严重）级别记录整个 JSON 请求体。当启用推送通知功能时，针对 端点的请求会调用该解析器，而请求中的 和 字段可能包含用于客户端推送端点的 Bearer 令牌和身份验证凭据。若一个合法的 JSON 请求体因包含严格解析模式下的未知字段或存在架构不匹配等原因导致 Protobuf 反序列化失败，这些敏感凭据便会以明文形式写入服务器

CVSS 5.7 · Medium
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I. Basic Information for CVE-2026-111762

Vulnerability Information
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Vulnerability Title
A2A Java SDK: Push notification credentials logged in cleartext on protobuf parse failure
Source: CVE Program / CVE List V5
Vulnerability Description
A2A Java SDK is the official Java SDK for the Agent2Agent (A2A) Protocol. Prior to 1.3.0.Final, RestHandler.parseRequestBody in `transport/rest/src/main/java/org/a2aproject/sdk/transport/rest/handler/RestHandler.java` logs the entire JSON request body at SEVERE level when JsonFormat.parser().merge() throws InvalidProtocolBufferException. With push notifications enabled, createTaskPushNotificationConfiguration reaches this parser for requests to `/v1/tenants/{tenant}/tasks/{taskId}/pushNotificationConfigs`, whose token and authentication.credentials fields can contain bearer tokens and authentication credentials for client push endpoints. A valid JSON body that fails protobuf deserialization, including an unknown field under strict parsing or a schema mismatch, causes those secrets to be written to the server logs in cleartext. An attacker with access to the server logs or a log aggregation system can retrieve the credentials and potentially use the credentials to send forged task status updates to the client's push notification endpoint. This issue is fixed in version 1.3.0.Final.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过日志文件的信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
a2aproject a2a-java < 1.3.0.Final -

II. Public POCs for CVE-2026-111762

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III. Intelligence Information for CVE-2026-111762

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Vendor Pages for CVE-2026-111762 (1)

Other References for CVE-2026-111762 (2)

Same Patch Batch · a2aproject · 2026-10-20 · 5 CVEs total

CVE-2026-111765 7.5 HIGH A2A Java SDK: Android synchronous POST forwards credentials across authorities after incom
CVE-2026-111764 7.5 HIGH A2A Java SDK has a fail-open default task authorization
CVE-2026-111761 5.8 MEDIUM A2A Java SDK has Server-Side Request Forgery (SSRF) in push-notification delivery
CVE-2026-111763 5.7 MEDIUM A2A Java SDK send client credentials under server-controlled HTTP header name, enabling le

IV. Related Vulnerabilities

Same product: a2a-java
Same vendor: a2aproject
Same weakness: CWE-532

V. Comments for CVE-2026-111762

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