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Recorded 22 Oct 2026 at 22:02 UTC. This is what ChangeIntel recorded, including the title, summary, facts and links. It is not a statement of the source's current position. See the latest record.

The historical field “Public exploit code” recorded Nuclei detection-template membership. It did not establish exploit availability. The original recorded fields remain below.

CVEMicrosoft Security Response Center

MessagePack-CSharp Denial of Service Vulnerability

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

What it said

CVE
CVE-2026-92707
Severity
Moderate
CVSS base score
5.3
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Impact
Denial of Service
Exploitation detected
Not reported by MSRC
Publicly disclosed
Yes
Exploitability
Exploitation Less Likely
Component
.NET
Weakness
CWE-1325: Improperly Controlled Sequential Memory Allocation
Issued by
GitHub_M
Customer action
Required: apply the update
Affected products
Microsoft Edge (Chromium-based), Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 11.0 runtime installed on Linux, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 11.0 runtime installed on Mac OS, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 11.0 runtime installed on Windows, System.Formats.Cbor on .NET 10.0 runtime installed on Linux, System.Formats.Cbor on .NET 10.0 runtime installed on Mac OS, System.Formats.Cbor on .NET 10.0 runtime installed on Windows, System.Formats.Cbor on .NET 8.0 runtime installed on Linux, System.Formats.Cbor on .NET 8.0 runtime installed on Mac OS, System.Formats.Cbor on .NET 8.0 runtime installed on Windows, System.Formats.Cbor on .NET 9.0 runtime installed on Linux, System.Formats.Cbor on .NET 9.0 runtime installed on Mac OS, System.Formats.Cbor on .NET 9.0 runtime installed on Windows
Updates that fix it
No KB listed
CISA KEV
Not listed in the collected catalog
EPSS
Not scored
Public exploit code
No Nuclei template listed
Published
13 Oct 2026 07:00 UTC
Last revised
15 Oct 2026 07:00 UTC
Revision note
Updated the Security Updates table to add KB article links for .NET 11.0. This is an informational change only; the fixed builds are unchanged.

Source evidence when recorded

Microsoft security releases
Complete at observationRead 22 Oct 2026 at 22:02 UTC
CISA KEV
Complete at observationRead 22 Oct 2026 at 22:02 UTC
FIRST EPSS
Complete at observationRead 22 Oct 2026 at 22:02 UTC
Public detection templates (Nuclei)
Complete at observationRead 22 Oct 2026 at 22:02 UTC

Coverage describes the sources at this observation. A complete read then does not establish their current position.

What changed

  1. Affected products: Microsoft Edge (Chromium-based), Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, 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, System.Formats.Cbor on .NET 10.0 installed on Linux, System.Formats.Cbor on .NET 10.0 installed on Mac OS, System.Formats.Cbor on .NET 10.0 installed on Windows, System.Formats.Cbor on .NET 8.0 installed on Linux, System.Formats.Cbor on .NET 8.0 installed on Mac OS, System.Formats.Cbor on .NET 8.0 installed on Windows, System.Formats.Cbor on .NET 9.0 installed on Linux, System.Formats.Cbor on .NET 9.0 installed on Mac OS, System.Formats.Cbor on .NET 9.0 installed on Windows → Microsoft Edge (Chromium-based), Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 11.0 runtime installed on Linux, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 11.0 runtime installed on Mac OS, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 11.0 runtime installed on Windows, System.Formats.Cbor on .NET 10.0 runtime installed on Linux, System.Formats.Cbor on .NET 10.0 runtime installed on Mac OS, System.Formats.Cbor on .NET 10.0 runtime installed on Windows, System.Formats.Cbor on .NET 8.0 runtime installed on Linux, System.Formats.Cbor on .NET 8.0 runtime installed on Mac OS, System.Formats.Cbor on .NET 8.0 runtime installed on Windows, System.Formats.Cbor on .NET 9.0 runtime installed on Linux, System.Formats.Cbor on .NET 9.0 runtime installed on Mac OS, System.Formats.Cbor on .NET 9.0 runtime installed on Windows
  2. 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 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, System.Formats.Cbor on .NET 10.0 installed on Linux, System.Formats.Cbor on .NET 10.0 installed on Mac OS, System.Formats.Cbor on .NET 10.0 installed on Windows, System.Formats.Cbor on .NET 8.0 installed on Linux, System.Formats.Cbor on .NET 8.0 installed on Mac OS, System.Formats.Cbor on .NET 8.0 installed on Windows, System.Formats.Cbor on .NET 9.0 installed on Linux, System.Formats.Cbor on .NET 9.0 installed on Mac OS, System.Formats.Cbor on .NET 9.0 installed on Windows → Microsoft Edge (Chromium-based), Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, 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, System.Formats.Cbor on .NET 10.0 installed on Linux, System.Formats.Cbor on .NET 10.0 installed on Mac OS, System.Formats.Cbor on .NET 10.0 installed on Windows, System.Formats.Cbor on .NET 8.0 installed on Linux, System.Formats.Cbor on .NET 8.0 installed on Mac OS, System.Formats.Cbor on .NET 8.0 installed on Windows, System.Formats.Cbor on .NET 9.0 installed on Linux, System.Formats.Cbor on .NET 9.0 installed on Mac OS, System.Formats.Cbor on .NET 9.0 installed on Windows
  3. Publisher revision note: Information published. → Updated the Security Updates table to add KB article links for .NET 11.0. This is an informational change only; the fixed builds are unchanged. · 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 → 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 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, System.Formats.Cbor on .NET 10.0 installed on Linux, System.Formats.Cbor on .NET 10.0 installed on Mac OS, System.Formats.Cbor on .NET 10.0 installed on Windows, System.Formats.Cbor on .NET 8.0 installed on Linux, System.Formats.Cbor on .NET 8.0 installed on Mac OS, System.Formats.Cbor on .NET 8.0 installed on Windows, System.Formats.Cbor on .NET 9.0 installed on Linux, System.Formats.Cbor on .NET 9.0 installed on Mac OS, System.Formats.Cbor on .NET 9.0 installed on Windows
Page history

Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.

Cite this version
Field-level log (7)

Up to 100 recent field edits are shown; older edits may be outside retention.

  1. 22 Oct 2026 · 22:02:57 UTC Affected productsMicrosoft Edge (Chromium-based), Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, 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, System.Formats.Cbor on .NET 10.0 installed on Linux, System.Formats.Cbor on .NET 10.0 installed on Mac OS, System.Formats.Cbor on .NET 10.0 installed on Windows, System.Formats.Cbor on .NET 8.0 installed on Linux, System.Formats.Cbor on .NET 8.0 installed on Mac OS, System.Formats.Cbor on .NET 8.0 installed on Windows, System.Formats.Cbor on .NET 9.0 installed on Linux, System.Formats.Cbor on .NET 9.0 installed on Mac OS, System.Formats.Cbor on .NET 9.0 installed on Windows → Microsoft Edge (Chromium-based), Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 11.0 runtime installed on Linux, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 11.0 runtime installed on Mac OS, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 11.0 runtime installed on Windows, System.Formats.Cbor on .NET 10.0 runtime installed on Linux, System.Formats.Cbor on .NET 10.0 runtime installed on Mac OS, System.Formats.Cbor on .NET 10.0 runtime installed on Windows, System.Formats.Cbor on .NET 8.0 runtime installed on Linux, System.Formats.Cbor on .NET 8.0 runtime installed on Mac OS, System.Formats.Cbor on .NET 8.0 runtime installed on Windows, System.Formats.Cbor on .NET 9.0 runtime installed on Linux, System.Formats.Cbor on .NET 9.0 runtime installed on Mac OS, System.Formats.Cbor on .NET 9.0 runtime installed on Windows
  2. 22 Oct 2026 · 22:02:57 UTC ExploitabilityNot assessed → Exploitation Less Likely
  3. 18 Oct 2026 · 14:54:30 UTC Link: October 2026/security?release=2026-Oct#cves
  4. 16 Oct 2026 · 16:13:25 UTC Affected productsMessagePack 2.5.303, Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, 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, System.Formats.Cbor on .NET 10.0 installed on Linux, System.Formats.Cbor on .NET 10.0 installed on Mac OS, System.Formats.Cbor on .NET 10.0 installed on Windows, System.Formats.Cbor on .NET 8.0 installed on Linux, System.Formats.Cbor on .NET 8.0 installed on Mac OS, System.Formats.Cbor on .NET 8.0 installed on Windows, System.Formats.Cbor on .NET 9.0 installed on Linux, System.Formats.Cbor on .NET 9.0 installed on Mac OS, System.Formats.Cbor on .NET 9.0 installed on Windows → Microsoft Edge (Chromium-based), Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, 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, System.Formats.Cbor on .NET 10.0 installed on Linux, System.Formats.Cbor on .NET 10.0 installed on Mac OS, System.Formats.Cbor on .NET 10.0 installed on Windows, System.Formats.Cbor on .NET 8.0 installed on Linux, System.Formats.Cbor on .NET 8.0 installed on Mac OS, System.Formats.Cbor on .NET 8.0 installed on Windows, System.Formats.Cbor on .NET 9.0 installed on Linux, System.Formats.Cbor on .NET 9.0 installed on Mac OS, System.Formats.Cbor on .NET 9.0 installed on Windows
  5. 15 Oct 2026 · 21:30:54 UTC Revision noteInformation published. → Updated the Security Updates table to add KB article links for .NET 11.0. This is an informational change only; the fixed builds are unchanged.
  6. 15 Oct 2026 · 21:30:54 UTC Last revised13 Oct 2026 07:00 UTC → 15 Oct 2026 07:00 UTC
  7. 15 Oct 2026 · 21:30:54 UTC Affected productsMessagePack 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 → 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 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, System.Formats.Cbor on .NET 10.0 installed on Linux, System.Formats.Cbor on .NET 10.0 installed on Mac OS, System.Formats.Cbor on .NET 10.0 installed on Windows, System.Formats.Cbor on .NET 8.0 installed on Linux, System.Formats.Cbor on .NET 8.0 installed on Mac OS, System.Formats.Cbor on .NET 8.0 installed on Windows, System.Formats.Cbor on .NET 9.0 installed on Linux, System.Formats.Cbor on .NET 9.0 installed on Mac OS, System.Formats.Cbor on .NET 9.0 installed on Windows
ChangeIntel

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Sources read 9 Nov 10:47 UTC · 275 of 275 readable · 273 fully read · documentation 469/469 current

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