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  4. CVE 2026 116477 a2aproject a2a dotnet parser
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Back to active CVEs
Medium · CVSS 5.3CVE-2026-116477

a2aproject a2a-dotnet Parser A2AJsonRpcProcessor.cs A2AJsonRpcProcessor.ProcessRequestAsync information exposureCVE-2026-116477

Answer in brief

CVE-2026-116477 records a Medium severity (CVSS 5.3) vulnerability in a2aproject a2a-dotnet Parser A2AJsonRpcProcessor.cs A2AJsonRpcProcessor.ProcessRequestAsync information exposure. The current sources do not mark it as known exploited. The current feed maps a2aproject/a2a-dotnet (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 26, 2026Updated Oct 26, 2026Source checked Oct 26, 2026First seen by HOL Oct 26, 2026Material review Oct 26, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps a2aproject/a2a-dotnet (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
a2aproject/a2a-dotnetgeneric1.0.0-preview2Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for a2aproject/a2a-dotnet.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Oct 26, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 26, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 26, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencevuldb.com
  • Source referencevuldb.com
  • Source referencevuldb.com
  • Source referencevuldb.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • a2aproject a2a-dotnet TaskProjection TaskProjection.ApplyStatus race conditionSame a2aproject/a2a-dotnet package
  • a2aproject a2a-go Push Notification agentexec.go CreateExecutor information exposureAlso CWE-209
  • a2aproject a2a-java JSON-RPC Error getMessage information exposureAlso CWE-209
  • Mem0: Cross-tenant conversation leak via unescaped delimiter collision in session-scope key (_build_session_scope)Also CWE-200

Record context

Vulnerability class
Arbitrary File Read
EPSS
Not reported
CWE IDs
CWE-209, CWE-200
Source
CVE List V5
Source checked
Oct 26, 2026
References
8 linked sources
Open source record