CVE-2026-48514 - Low Severity Vulnerability
Vulnerable Library - messagepack.3.1.4.nupkg
Extremely Fast MessagePack(MsgPack) Serializer for C# (.NET Framework, .NET 6, Unity, Xamarin).
Library home page: https://api.nuget.org/packages/messagepack.3.1.4.nupkg
Path to dependency file: /src/SharpConnector.Tests/SharpConnector.Tests.csproj
Path to vulnerable library: /home/wss-scanner/.nuget/packages/messagepack/3.1.4/messagepack.3.1.4.nupkg,/home/wss-scanner/.nuget/packages/messagepack/3.1.4/messagepack.3.1.4.nupkg,/home/wss-scanner/.nuget/packages/messagepack/3.1.4/messagepack.3.1.4.nupkg
Dependency Hierarchy:
- enyimmemcachedcore.3.5.0.nupkg (Root Library)
- ❌ messagepack.3.1.4.nupkg (Vulnerable Library)
Found in base branch: develop
Vulnerability Details
MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.301 and 3.1.7, UnsafeBlitFormatterBase.Deserialize reads an attacker-controlled byteLength from an extension payload and allocates an array based on that value before validating it against the extension header length or remaining payload bytes. The outer extension header is bounded by available input, but that bound is not used to constrain the inner byteLength before allocation. A very small payload can therefore request a very large T[] allocation. This vulnerability is fixed in 2.5.301 and 3.1.7.
Publish Date: 2026-06-22
URL: CVE-2026-48514
CVSS 3 Score Details (3.7)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: High
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: Low
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: GHSA-w567-gjr2-hm5j
Release Date: 2026-06-22
Fix Resolution: messagepack - 3.1.7,messagepack - 2.5.301,MessagePack - 2.5.301,MessagePack - 3.1.7
Step up your Open Source Security Game with Mend here
CVE-2026-48514 - Low Severity Vulnerability
Extremely Fast MessagePack(MsgPack) Serializer for C# (.NET Framework, .NET 6, Unity, Xamarin).
Library home page: https://api.nuget.org/packages/messagepack.3.1.4.nupkg
Path to dependency file: /src/SharpConnector.Tests/SharpConnector.Tests.csproj
Path to vulnerable library: /home/wss-scanner/.nuget/packages/messagepack/3.1.4/messagepack.3.1.4.nupkg,/home/wss-scanner/.nuget/packages/messagepack/3.1.4/messagepack.3.1.4.nupkg,/home/wss-scanner/.nuget/packages/messagepack/3.1.4/messagepack.3.1.4.nupkg
Dependency Hierarchy:
Found in base branch: develop
MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.301 and 3.1.7, UnsafeBlitFormatterBase.Deserialize reads an attacker-controlled byteLength from an extension payload and allocates an array based on that value before validating it against the extension header length or remaining payload bytes. The outer extension header is bounded by available input, but that bound is not used to constrain the inner byteLength before allocation. A very small payload can therefore request a very large T[] allocation. This vulnerability is fixed in 2.5.301 and 3.1.7.
Publish Date: 2026-06-22
URL: CVE-2026-48514
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: High
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: Low
For more information on CVSS3 Scores, click here.Type: Upgrade version
Origin: GHSA-w567-gjr2-hm5j
Release Date: 2026-06-22
Fix Resolution: messagepack - 3.1.7,messagepack - 2.5.301,MessagePack - 2.5.301,MessagePack - 3.1.7
Step up your Open Source Security Game with Mend here