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CVE-2026-117504— a2aproject a2a-go Distributed Manager distributed_manager.go Cancel denial of service

Quick assessment

Affected

a2aproject a2a-go

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-go 项目（版本 2.4.0 及更早版本）中发现了一个安全漏洞。受影响的组件是“分布式管理器”（Distributed Manager），具体位于文件中的函数。该漏洞可被远程利用，导致服务拒绝（DoS）。将组件升级至 2.5.0 版本即可修复此问题，对应的补丁提交哈希为。建议尽快升级受影响的组件。

CVSS 5.3 · Medium Updated Oct 27, 2026

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood

Affected Version Matrix 6

Vendor	Product	Version Range	Status
a2aproject	a2a-go	`2.0`	affected
		`2.1`	affected
		`2.2`	affected
		`2.3`	affected
		`2.4.0`	affected
		`2.5.0`	unaffected

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Vulnerability Information

Have questions about the vulnerability? See if Shenlong's analysis helps!

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Vulnerability Title

a2aproject a2a-go Distributed Manager distributed_manager.go Cancel denial of service

Source: CVE Program / CVE List V5

Vulnerability Description

A vulnerability was identified in a2aproject a2a-go up to 2.4.0. The affected element is the function Cancel of the file internal/taskexec/distributed_manager.go of the component Distributed Manager. Such manipulation leads to denial of service. It is possible to launch the attack remotely. Upgrading to version 2.5.0 is sufficient to fix this issue. The name of the patch is 14e41a978b31e134ffa1170d8657f9dd98529aa3. Upgrading the affected component is advised.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Source: CVE Program / CVE List V5

Vulnerability Type

不恰当的资源关闭或释放

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
a2aproject	a2a-go	2.0	`cpe:2.3:a:a2aproject:a2a-go::::::::`

II. Public POCs for CVE-2026-117504

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-117504

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Vendor Pages for CVE-2026-117504 (1)

🔗 GitHub - a2aproject/a2a-go: Golang SDK for A2A Protocol · GitHub product

Other References for CVE-2026-117504 (6)

https://github.com/a2aproject/a2a-go/commit/14e41a978b31e134ffa1170d8657f9dd98529aa3 patch
https://github.com/a2aproject/a2a-go/pull/409 issue-tracking patch
https://vuldb.com/cve/CVE-2026-117504 third-party-advisory
https://vuldb.com/vuln/427071/cti signature permissions-required
https://vuldb.com/submit/1015053 third-party-advisory
https://vuldb.com/vuln/427071 vdb-entry technical-description

https://www.cve.org/CVERecord?id=CVE-2026-117504

Same Patch Batch · a2aproject · 2026-10-27 · 5 CVEs total

CVE-2026-117507	5.4 MEDIUM	a2aproject a2a-java TaskManager.saveTaskEvent race condition
CVE-2026-117503	5.3 MEDIUM	a2aproject a2a-go REST SSE handler rest.go resource consumption
CVE-2026-117505	4.3 MEDIUM	a2aproject a2a-java ChildQueue queue.offer resource consumption
CVE-2026-117506	4.3 MEDIUM	a2aproject a2a-java Push Notification Config Store JpaDatabasePushNotificationConfigStore.

IV. Related Vulnerabilities

Same product: a2a-go

Same vendor: a2aproject

Same weakness: CWE-404