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CVE-2026-92707ModerateDisclosedDoSNetwork

MessagePack-CSharp Denial of Service Vulnerability

MSRC advisory NVD CVE.org

Assessment

Improperly controlled sequential memory allocation in .NET allows an unauthorized attacker to deny service over a network.

Severity
Moderate
CVSS base score
5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Impact
Denial of Service
EPSS, next 30 days
Not scored yet
Public exploit code
No Nuclei template lists it
Exploitability
Not assessed
Publicly disclosed
Yes
Customer action
Required: apply the update
Component
.NET
Weakness
CWE-1325: Improperly Controlled Sequential Memory Allocation
Issued by
GitHub_M
Published
13 Oct 2026 · October 2026
Last revised
13 Oct 2026
CVSS 3.1 base metricsRed raises the risk · green lowers it
Attack vector
NetworkAV:N
Attack complexity
LowAC:L
Privileges required
NonePR:N
User interaction
NoneUI:N
Scope
UnchangedS:U
Confidentiality
NoneC:N
Integrity
NoneI:N
Availability
LowA:L

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

Developer Tools, Open Source Software, Other
15 affected products
  • MessagePack 2.5.303
  • Microsoft Visual Studio 2022 version 17.14
  • Microsoft Visual Studio 2026 version 18.10
  • Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 10.0 installed on Linux
  • Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 10.0 installed on Mac OS
  • Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 10.0 installed on Windows
  • Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 11.0 installed on Linux
  • Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 11.0 installed on Mac OS
  • Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 11.0 installed on Windows
  • Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 8.0 installed on Linux
  • Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 8.0 installed on Mac OS
  • Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 8.0 installed on Windows
  • Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 9.0 installed on Linux
  • Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 9.0 installed on Mac OS
  • Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 9.0 installed on Windows

What changed

First observed 14 Oct 2026

No field changes in the recorded history.

Cite this recorded revision to keep the same title, summary, facts and links when the page changes.

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ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

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