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Updated Aspire.Hosting.JavaScript from 13.6.1 to 13.6.3.

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13.6.2

Full commit: af07e33f8d1ef733645138b3f8e36067d073148d

What's Changed

• [release/13.6] Bump version to 13.6.2 by @​danegsta with @​Copilot in [release/13.6] Bump version to 13.6.2 microsoft/aspire#20877
• [release/13.6] Pin MessagePack to 2.5.307 for security fixes by @​eerhardt in [release/13.6] Pin MessagePack to 2.5.307 for security fixes microsoft/aspire#21156

Full Changelog: microsoft/aspire@v13.6.1...v13.6.2

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Updated Aspire.Hosting.PostgreSQL from 13.6.1 to 13.6.3.

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Sourced from Aspire.Hosting.PostgreSQL's releases.

13.6.2

Full commit: af07e33f8d1ef733645138b3f8e36067d073148d

What's Changed

• [release/13.6] Bump version to 13.6.2 by @​danegsta with @​Copilot in [release/13.6] Bump version to 13.6.2 microsoft/aspire#20877
• [release/13.6] Pin MessagePack to 2.5.307 for security fixes by @​eerhardt in [release/13.6] Pin MessagePack to 2.5.307 for security fixes microsoft/aspire#21156

Full Changelog: microsoft/aspire@v13.6.1...v13.6.2

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Updated Aspire.Hosting.Redis from 13.6.1 to 13.6.3.

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Sourced from Aspire.Hosting.Redis's releases.

13.6.2

Full commit: af07e33f8d1ef733645138b3f8e36067d073148d

What's Changed

• [release/13.6] Bump version to 13.6.2 by @​danegsta with @​Copilot in [release/13.6] Bump version to 13.6.2 microsoft/aspire#20877
• [release/13.6] Pin MessagePack to 2.5.307 for security fixes by @​eerhardt in [release/13.6] Pin MessagePack to 2.5.307 for security fixes microsoft/aspire#21156

Full Changelog: microsoft/aspire@v13.6.1...v13.6.2

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Updated Aspire.Hosting.Testing from 13.6.1 to 13.6.3.

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Sourced from Aspire.Hosting.Testing's releases.

13.6.2

Full commit: af07e33f8d1ef733645138b3f8e36067d073148d

What's Changed

• [release/13.6] Bump version to 13.6.2 by @​danegsta with @​Copilot in [release/13.6] Bump version to 13.6.2 microsoft/aspire#20877
• [release/13.6] Pin MessagePack to 2.5.307 for security fixes by @​eerhardt in [release/13.6] Pin MessagePack to 2.5.307 for security fixes microsoft/aspire#21156

Full Changelog: microsoft/aspire@v13.6.1...v13.6.2

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Updated MessagePack from 2.5.303 to 2.5.307.

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2.5.307

Security fix

• Fix LZ4 decompression integer overflow bug

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.5.305...v2.5.307

2.5.305

Security fix

• Fixes Unescaped dot metacharacters in AssemblyNameVersionSelectorRegex cause catastrophic backtracking

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.5.303...v2.5.305

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Updated Microsoft.OpenApi from 2.12.2 to 2.13.0.

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2.13.0

2.13.0 (2026-10-19)

Features

• document: add GetOperationById to search operations across path… (#​3025) (#​3074) (75d6cea)

Bug Fixes

• components-key validation timeouts under load (#​3108) (#​3112) (5369417)
• openapi: omit null response descriptions (1344a43)

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Updated ModelContextProtocol.AspNetCore from 2.2.0 to 2.3.0.

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Sourced from ModelContextProtocol.AspNetCore's releases.

2.3.0

This release improves HTTP discovery, OAuth, protocol interoperability, and shutdown reliability, preserves registration order for server primitives, and exposes a TimeProvider for deterministic client timeout tests. It also corrects optional server-identity handling; applications reading McpClient.ServerInfo should adopt nullable handling.

Breaking Changes

Refer to the C# SDK Versioning documentation for details on versioning and breaking change policies.

1. McpClient.ServerInfo is nullable — #​1903
   • Its return annotation changes from Implementation to Implementation?. Existing non-nullable assignments or dereferences can produce nullable warnings and fail warnings-as-errors builds.
   • On 2026-07-28 connections, ServerInfo is null when the server omits optional identity metadata from server/discover. Legacy initialize still requires serverInfo. Reading the property before connecting still throws InvalidOperationException.
   • Migrate with a null check or a fallback such as client.ServerInfo?.Name ?? "Unknown server". Self-reported identity must not be used for security decisions.
   • This corrective source-compatibility change is intentionally included in 2.3.0.

What's Changed

• Correct protocol-version telemetry for stateless server spans #​1810 by @​luisangelrod
• Preserve HTTP errors and correct discovery fallback handling #​1791 by @​PranavSenthilnathan (co-authored by @​Copilot)
• Make modern Streamable HTTP status mapping deterministic #​1837 by @​jstar0
  • Modern responses wait for the first protocol message before sending headers; long-running silent handlers may need progress output or an appropriate HTTP timeout. Legacy eager-header behavior is preserved.
• Accept opaque legacy metadata and correct request-scoped capabilities and discovery advertisement #​1852 by @​halter73 (co-authored by @​Copilot)
• Avoid redundant SSE fallback after discovery is rejected with 400 or 404 #​1855 by @​scottt732
• Close server stdin before waiting for graceful stdio process exit #​1838 by @​luisangelrod
• Preserve insertion order when listing server tools, prompts, and resources #​1924 by @​PederHP (co-authored by Claude Opus 5.5)
• Allow missing optional server identity in discovery and make ServerInfo nullable #​1903 by @​Coding-Professional
• Include JSON parse details in Streamable HTTP 400 responses #​1844 by @​ump45nose
• Exclude OAuth from DiscoverProbeTimeout, expose McpClientOptions.TimeProvider for deterministic timeout tests, and default SSE to legacy initialization #​1719 by @​halter73 (co-authored by @​Copilot)
  • OAuth remains subject to the overall InitializationTimeout and caller cancellation; it is excluded only from the short discovery-probe budget.
  • Modern discovery over SSE requires both explicit HttpTransportMode.Sse and ProtocolVersion = "2026-07-28"; pinning the version with AutoDetect is not equivalent.
• Preserve numeric progress tokens in RequestOptions serialization #​1832 by @​dfedoryshchev
• Dispose legacy SSE POST responses to release connections deterministically #​1841 by @​yalcinfu22 (co-authored by Claude Fable 5)

Documentation Updates

• Document standing support for new MCP specification revisions #​1826 by @​halter73 (co-authored by @​Copilot)

Test Improvements

• Stabilize discovery-capable test connections while retaining initialization deadlines #​1943 by @​tarekgh

Repository Infrastructure Updates

• Add a source selector for manual documentation publishes #​1828 by @​jeffhandley (co-authored by @​Copilot)
• Update SourceLink's private build dependency to resolve a vulnerable Git dependency #​1873 by @​halter73 (co-authored by @​Copilot)
• Correct obsolete McpServerFactory references in Copilot instructions #​1892 by @​Zir0-93
• Update Microsoft.Extensions.AI and AI.Abstractions to 10.11.0 and align shared System dependencies to 10.0.13 #​1940

Acknowledgements

• @​scottt732 made their first contribution in #​1855
• @​Zir0-93 made their first contribution in #​1892
• @​Coding-Professional made their first contribution in #​1903
  ... (truncated)

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