TI-2026-81185 Aliases CVE-2026-117504 GHSA-339m-8vxp-vp6f

Denial of service in a2aproject a2a-go Distributed Manager Cancel

LOW 37CWE-404Published 2026-10-27 · Updated 2026-11-02

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · Low
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-404.

Summary

The a2aproject a2a-go package up to and including 2.4.0 has a flaw in the Cancel function of the Distributed Manager. The code does not properly shut down or release resources (CWE-404), which lets a remote attacker without privileges or user interaction cause a denial of service.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00552 46th percentileScored 2026-11-07

Fix Fixed a2a-go (a2aproject): 2.5.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
a2aproject	a2a-go	2.0; 2.1; 2.2; 2.3; 2.4.0	2.5.0	Patch available	CNA

a2a-go Vendora2aproject Affected 2.0; 2.1; 2.2; 2.3; 2.4.0 Fixed in 2.5.0 Patch available CNA

CPE names CNA · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:a2aproject:a2a-go::::::::	—	—	a2aproject

cpe:2.3:a:a2aproject:a2a-go:*:*:*:*:*:*:*:* Versions — — ·a2aproject

Remediation

Upgrade a2aproject a2a-go to version 2.5.0, which fixes this issue. The fix is available as patch 14e41a978b31e134ffa1170d8657f9dd98529aa3.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Fix · CNA a2a-go (a2aproject) Fixed in 2.5.0

Timeline

2026-10-27 Threatist record created from CVE-2026-117504
2026-10-27 Alias added: GHSA-339m-8vxp-vp6f
2026-10-28 Priority changed: MEDIUM → LOW
2026-11-02 CISA SSVC decision points changed

References

Patch 3

Other 1

https://github.com/a2aproject/a2a-go/

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TI-2026-76847 Server-side request forgery in A2A Java SDK push notifications CVSS 3.1MEDIUM 5.8
TI-2026-81183 Resource consumption in a2aproject a2a-go REST SSE handler CVSS 4.0MEDIUM 6.9
TI-2026-61722 HTTP response splitting in a2aproject a2a-java CVSS 4.0MEDIUM 6.9
TI-2026-80567 Error message leaks sensitive information in a2a-go CreateExecutor CVSS 4.0MEDIUM 6.9

See all 21 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences