Medium severity · published Oct 26, 2026
CVE-2026-116477
a2aproject a2a-dotnet Parser A2AJsonRpcProcessor.cs A2AJsonRpcProcessor.ProcessRequestAsync information exposure
New
4.3
CVSS
0.3%
EPSS
No
On KEV
Description
A security vulnerability has been detected in a2aproject a2a-dotnet up to 1.0.0-preview2. The impacted element is the function A2AJsonRpcProcessor.ProcessRequestAsync of the file src/A2A.AspNetCore/A2AJsonRpcProcessor.cs of the component Parser. The manipulation leads to information exposure through error message. It is possible to initiate the attack remotely. Upgrading to version 1.0.0-preview3 is sufficient to resolve this issue. The identifier of the patch is ccbd12b6108a6a8f0fd5d8b4a9ece3c8a94ba1e4. Upgrading the affected component is recommended.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 24% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
A2
a2a-dotnet · a2aproject
1.0.0-preview2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-116477
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-116477
github.com
https://github.com/a2aproject/a2a-dotnet/
github.com
https://github.com/a2aproject/a2a-dotnet/commit/ccbd12b6108a6a8f0fd5d8b4a9ece3c8a94ba1e4
github.com
https://github.com/a2aproject/a2a-dotnet/pull/452
github.com
https://github.com/a2aproject/a2a-dotnet/releases/tag/v1.0.0-preview3
vuldb.com
https://vuldb.com/cve/CVE-2026-116477
vuldb.com
https://vuldb.com/submit/1014890
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