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CVE-2026-116476— a2aproject a2a-dotnet TaskProjection TaskProjection.ApplyStatus race condition

Quick assessment

Affected
a2aproject a2a-dotnet
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.

在 a2aproject 的 a2a-dotnet 项目（版本 1.0.0-preview3 及以下）中发现了一个安全弱点。受影响的组件是 TaskProjection，具体涉及其函数 TaskProjection.ApplyStatus。对该函数执行特定操作可能引发竞态条件（race condition）。攻击者可从远程发起此类攻击。目前，用于修复该问题的拉取请求（Pull Request）尚待审核接受。

CVSS 5.4 · Medium

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services
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I. Basic Information for CVE-2026-116476

Vulnerability Information
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Vulnerability Title
a2aproject a2a-dotnet TaskProjection TaskProjection.ApplyStatus race condition
Source: CVE Program / CVE List V5
Vulnerability Description
A weakness has been identified in a2aproject a2a-dotnet up to 1.0.0-preview3. The affected element is the function TaskProjection.ApplyStatus of the component TaskProjection. Executing a manipulation can lead to race condition. The attack may be performed from remote. The pull request to fix this issue awaits acceptance.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
a2aproject a2a-dotnet 1.0.0-preview3 cpe:2.3:a:a2aproject:a2a-dotnet:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-116476

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-116476

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Patches & Fixes for CVE-2026-116476 (1)

Vendor Pages for CVE-2026-116476 (1)

Same Patch Batch · a2aproject · 2026-10-26 · 4 CVEs total

CVE-2026-116478 5.3 MEDIUM a2aproject a2a-go Push Notification agentexec.go CreateExecutor information exposure
CVE-2026-116479 4.3 MEDIUM a2aproject a2a-java JSON-RPC Error getMessage information exposure
CVE-2026-116477 4.3 MEDIUM a2aproject a2a-dotnet Parser A2AJsonRpcProcessor.cs A2AJsonRpcProcessor.ProcessRequestAsyn

IV. Related Vulnerabilities

Same product: a2a-dotnet
Same vendor: a2aproject
Same weakness: CWE-362