[release/13.4] Bump StreamJsonRpc to 2.25.29 to clear MessagePack NU1903

[aspire-repo-bot]

Backport of #18155 to release/13.4

/cc @mitchdenny

Customer Impact

Customers running dotnet new aspire-starter see an NU1903 warning that the transitive MessagePack 2.5.192 package has a known high severity vulnerability (GHSA-hv8m-jj95-wg3x / CVE-2026-48109). Aspire is not directly exposed (no MessagePack code paths reached at runtime; JsonRpc traffic uses System.Text.Json over local Unix domain sockets), but the warning is surfaced to every Aspire user on package restore and is noisy enough that customers think they need to act on it.

Testing

Validated by the full CI suite on #18155, including the template tests (templates-* jobs across xUnit / NUnit / MSTest / "new up and build" matrices) which exercise dotnet new aspire-starter and build the generated AppHost projects under both the current and previous SDKs. The NU1903 warning is gone in the generated projects after the bump.

Risk

Very low. The change is a transitive dependency bump in Aspire.Hosting (StreamJsonRpc 2.22.23 -> 2.25.29) plus a Directory.Packages.props version update. StreamJsonRpc public surface remained backwards compatible and the analyzer-Roslyn-compatibility regression that bit 2.25.25-2.25.28 is fixed in 2.25.29 (vs-streamjsonrpc#1463 / #1399), so no MSBuild workaround is required.

Regression?

No. The MessagePack advisory was published after 13.4 snapped; this is the first cut at it.

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[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/microsoft/aspire/main/eng/scripts/get-aspire-cli-pr.sh | bash -s -- 18204

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/microsoft/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 18204"

[github-actions]

❓ CLI E2E Tests unknown — 112 passed, 0 failed, 2 unknown (commit 4b9e4fc)

View all recordings

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✅	AddPackageInteractiveWhileAppHostRunningDetached	Recording · Job · CLI logs
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✅	TypeScriptAppHostRunDoesNotDeadlockWhenLazyOptionsInvokeAsyncCallback	Recording · Job · CLI logs
✅	UnAwaitedChainsCompileWithAutoResolvePromises	Recording · Job · CLI logs
❔	UpdateProjectChannelToStable_CSharpEmptyAppHost_PreservesAspireConfigChannel	Recording · Job · CLI logs
✅	UpdateProjectChannelToStable_CSharpSingleFileInit_PreservesAspireConfigChannel	Recording · Job · CLI logs
✅	UpdateProjectChannelToStable_TypeScriptSingleFileInit_PreservesAspireConfigChannel	Recording · Job · CLI logs
✅	UpdateProjectChannelToStable_TypeScript_PreviewsStablePackagesAndPreservesChannel	Recording · Job · CLI logs

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_{📹 Recordings uploaded automatically from CI run #27521232193}