TI-2026-80557 Aliases CVE-2026-116476 GHSA-xrh4-gq3g-5r95

Race condition in a2a-dotnet TaskProjection.ApplyStatus

LOW 23CWE-362Published 2026-10-26 · Updated 2026-11-02

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: None · Low · Low
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

a2aproject a2a-dotnet up to 1.0.0-preview3 contains a race condition (CWE-362) in the TaskProjection.ApplyStatus function. Improper synchronization of shared resources lets concurrent operations interfere with each other. A remote attacker with low privileges can trigger this, with low impact to integrity and availability.

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

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00202 10th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
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-dotnet	1.0.0-preview3	—	No fix listed	CNA

a2a-dotnet Vendora2aproject Affected 1.0.0-preview3 Fixed in — No fix listed CNA

CPE names CNA · 1

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

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

Remediation

The sources list no fixed version for a2a-dotnet. A pull request to fix this issue awaits acceptance.

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

Timeline

2026-10-26 Threatist record created from CVE-2026-116476
2026-10-27 Alias added: GHSA-xrh4-gq3g-5r95
2026-11-02 CISA SSVC decision points changed

References

Patch 1

https://github.com/a2aproject/a2a-dotnet/pull/453

Other 1

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

TI-2026-76905 Android A2A Java SDK forwards API keys across redirects CVSS 3.1HIGH 7.5
TI-2026-76904 A2A Java SDK default task store skips authorization on task reads CVSS 3.1HIGH 7.5
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-2026-81185 Denial of service in a2aproject a2a-go Distributed Manager Cancel 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