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@dependabot dependabot bot commented on behalf of github Jan 29, 2026

Updated MessagePack from 2.4.35 to 2.5.187.

Release notes

Sourced from MessagePack's releases.

2.5.187

Changes:

  • #​2014: Use a collision-resistant hash algorithm for untrusted data to address GHSA-4qm4-8hg2-g2xm
  • #​2010: Update published security policy

This list of changes was auto generated.

2.5.172

What's Changed

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.5.171...v2.5.172

2.5.171

What's Changed

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.5.168...v2.5.171

2.5.168

What's Changed

New Contributors

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.5.140...v2.5.168

2.5.140

What's Changed

New Contributors

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.5.129...v2.5.140

2.5.129

What's Changed

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.5.124...v2.5.129

2.5.124

What's Changed

New Contributors

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.5.108...v2.5.124

2.5.108

What's Changed

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.5.103...v2.5.108

2.5.103

What's Changed

New Contributors

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.5.94...v2.5.103

2.5.94

What's Changed

New Contributors

... (truncated)

2.5.64-alpha

What's Changed

New Contributors

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.4.23-alpha...v2.5.64-alpha

2.4.59

What's Changed

New Contributors

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.4.35...v2.4.59

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📦 This PR updates the MessagePack NuGet package from version 2.4.35 to 2.5.187 across two sandbox projects. The update includes important security fixes, performance improvements, and new features accumulated over multiple releases.

🔍 Detailed Analysis

Key Changes

  • Dependency Update: MessagePack package upgraded from 2.4.35 to 2.5.187 in both Benchmark and SandboxConsoleApp projects
  • Security Enhancement: Version 2.5.187 includes a critical security fix addressing hash collision vulnerabilities (GHSA-4qm4-8hg2-g2xm)
  • Feature Additions: Multiple new features including support for [MessagePackFormatter] on parameters/return values, .NET 8 support, and improved Unity compatibility

Technical Implementation

flowchart TD
    A[Dependabot Scan] --> B[Detect MessagePack 2.4.35]
    B --> C[Check Latest Version 2.5.187]
    C --> D[Update Benchmark.csproj]
    C --> E[Update SandboxConsoleApp.csproj]
    D --> F[Security Fix Applied]
    E --> F
    F --> G[Performance Improvements]
    G --> H[New Features Available]
Loading

Impact

  • Security: Addresses hash collision vulnerability with collision-resistant hash algorithm for untrusted data
  • Performance: Includes various performance optimizations like reduced buffer allocations and improved ASP.NET Core integration
  • Compatibility: Enhanced support for .NET 8, Unity 2021.2+, and improved nullable reference type annotations
  • Functionality: New features like [NonSerialized] field support, better error messages, and improved formatter generation

Created with Palmier

Bumps MessagePack from 2.4.35 to 2.5.187

---
updated-dependencies:
- dependency-name: MessagePack
  dependency-version: 2.5.187
  dependency-type: direct:production
  dependency-group: nuget
- dependency-name: MessagePack
  dependency-version: 2.5.187
  dependency-type: direct:production
  dependency-group: nuget
...

Signed-off-by: dependabot[bot] <support@github.com>
@dependabot dependabot bot added dependencies Pull requests that update a dependency file .NET Pull requests that update .NET code labels Jan 29, 2026
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Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff Package Supply Chain
Security
Vulnerability Quality Maintenance License
Updatedmessagepack@​2.4.35 ⏵ 2.5.18798100 +290100100 +20

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