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CVE-2026-92707ModerateDisclosedDoSNetworkRevised 15 Oct

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 · 30-day forecast
No EPSS score collected
Public detection template
No Nuclei template is listed in the current collected catalog
Exploitation detected
No known exploitation (MSRC assessment)
Exploitability
Exploitation Less Likely
Publicly disclosed
Yes (MSRC assessment)
Customer action
Required: follow the MSRC remediation guidance
Component
.NET
Weakness
CWE-1325: Improperly Controlled Sequential Memory Allocation
Issued by
GitHub_M
Published
13 Oct 2026 · October 2026
Last revised
15 Oct 2026Updated the Security Updates table to add KB article links for .NET 11.0. This is an informational change only; the fixed builds are unchanged.
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

No KB update is listed in the collected MSRC record. Check the MSRC advisory for product releases and other remedies.

Affected products

Developer Tools, Open Source Software, Other
16 affected products
  • MessagePack 2.5.303
  • MessagePack 3.1.9
  • Microsoft Visual Studio 2022 version 17.14
  • Microsoft Visual Studio 2026 version 18.10
  • Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 10.0 runtime installed on Linux
  • Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 10.0 runtime installed on Mac OS
  • Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 10.0 runtime installed on Windows
  • 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
  • Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 8.0 runtime installed on Linux
  • Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 8.0 runtime installed on Mac OS
  • Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 8.0 runtime installed on Windows
  • Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 9.0 runtime installed on Linux
  • Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 9.0 runtime installed on Mac OS
  • Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 9.0 runtime installed on Windows

What changed

  1. Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  2. Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  3. Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  4. Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  5. Detection template: No Nuclei template listed · Customer action: Required: apply the update → Required: follow the MSRC remediation guidance · Public disclosure: Yes → Yes (MSRC assessment) · Exploitation detected: Not reported by MSRC → No known exploitation (MSRC assessment)
  6. 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 → MessagePack 2.5.303, MessagePack 3.1.9, Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 10.0 runtime installed on Linux, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 10.0 runtime installed on Mac OS, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 10.0 runtime installed on Windows, 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, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 8.0 runtime installed on Linux, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 8.0 runtime installed on Mac OS, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 8.0 runtime installed on Windows, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 9.0 runtime installed on Linux, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 9.0 runtime installed on Mac OS, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 9.0 runtime installed on Windows
  7. Detection template: Unknown: exploit-code evidence is incomplete or retained → No Nuclei template listed · CISA KEV: Unknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
  8. Detection template: No Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained · CISA KEV: Not listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
  9. 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
  10. 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
  11. 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 (41)

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

  1. 6 Nov 2026 · 17:32:22 UTC Public detection templateUnknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  2. 6 Nov 2026 · 17:32:22 UTC Source coverage: public-exploit-codeIncomplete → Current
  3. 6 Nov 2026 · 17:32:22 UTC Source coverage: first-epssIncomplete → Current
  4. 6 Nov 2026 · 17:32:22 UTC Source coverage: msrc-cvrfIncomplete → Current
  5. 6 Nov 2026 · 16:31:02 UTC Public detection templateNo Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  6. 6 Nov 2026 · 16:31:02 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  7. 6 Nov 2026 · 16:31:02 UTC Source coverage: first-epssCurrent → Incomplete
  8. 6 Nov 2026 · 16:31:02 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  9. 2 Nov 2026 · 17:30:39 UTC Public detection templateUnknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  10. 2 Nov 2026 · 17:30:39 UTC Source coverage: public-exploit-codeIncomplete → Current
  11. 2 Nov 2026 · 17:30:39 UTC Source coverage: first-epssIncomplete → Current
  12. 2 Nov 2026 · 17:30:39 UTC Source coverage: msrc-cvrfIncomplete → Current
  13. 2 Nov 2026 · 16:27:39 UTC Public detection templateNo Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  14. 2 Nov 2026 · 16:27:39 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  15. 2 Nov 2026 · 16:27:39 UTC Source coverage: first-epssCurrent → Incomplete
  16. 2 Nov 2026 · 16:27:39 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  17. 29 Oct 2026 · 20:19:26 UTC Public detection templateNo Nuclei template listed
  18. 29 Oct 2026 · 20:19:26 UTC EPSSNot scored → No EPSS score collected
  19. 29 Oct 2026 · 20:19:26 UTC Customer actionRequired: apply the update → Required: follow the MSRC remediation guidance
  20. 29 Oct 2026 · 20:19:26 UTC Publicly disclosedYes → Yes (MSRC assessment)
  21. 29 Oct 2026 · 20:19:26 UTC Exploitation detectedNot reported by MSRC → No known exploitation (MSRC assessment)
  22. 25 Oct 2026 · 19:05:13 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 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 → MessagePack 2.5.303, MessagePack 3.1.9, Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 10.0 runtime installed on Linux, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 10.0 runtime installed on Mac OS, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 10.0 runtime installed on Windows, 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, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 8.0 runtime installed on Linux, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 8.0 runtime installed on Mac OS, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 8.0 runtime installed on Windows, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 9.0 runtime installed on Linux, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 9.0 runtime installed on Mac OS, Microsoft.AspNetCore.SignalR.Protocols.MessagePack on .NET 9.0 runtime installed on Windows
  23. 23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
  24. 23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
  25. 23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
  26. 23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
  27. 23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
  28. 23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
  29. 23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
  30. 23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
  31. 23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  32. 23 Oct 2026 · 08:31:50 UTC Source coverage: first-epssCurrent → Incomplete
  33. 23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete
  34. 23 Oct 2026 · 08:31:50 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  35. 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
  36. 22 Oct 2026 · 22:02:57 UTC ExploitabilityNot assessed → Exploitation Less Likely
  37. 18 Oct 2026 · 14:54:30 UTC Link: October 2026/security?release=2026-Oct#cves
  38. 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
  39. 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.
  40. 15 Oct 2026 · 21:30:54 UTC Last revised13 Oct 2026 07:00 UTC → 15 Oct 2026 07:00 UTC
  41. 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

Explore global source statements, affected packages and advisory history for CVE-2026-92707. The catalog has a separate collection scope from Microsoft release records.

Collected exploitation and prediction evidence

Risk source coverage

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

CVE-2026-92707

No KEV entry is attached to this observation; this is not evidence that exploitation is absent.

FIRST EPSS: 0.68 % · percentile 52.58 % · scored 8 Nov 2026.

Observed 08 Nov 2026 15:12:21 UTC · Complete immutable risk JSON

Dated risk observations

Risk history is separate from CNA/OSV content history. Daily score drift is retained but only an upward crossing of 10% triggers the prediction change event.

CVE-2026-92707 · 08 Nov 2026 15:12:21 UTC

CVE-2026-92707 · 07 Nov 2026 16:07:52 UTC

CVE-2026-92707 · 06 Nov 2026 19:10:17 UTC

CVE-2026-92707 · 05 Nov 2026 22:49:22 UTC

CVE-2026-92707 · 05 Nov 2026 02:54:06 UTC

CVE-2026-92707 · 03 Nov 2026 16:59:18 UTC

CVE-2026-92707 · 02 Nov 2026 23:59:04 UTC

CVE-2026-92707 · 01 Nov 2026 23:58:58 UTC

CVE-2026-92707 · 01 Nov 2026 03:04:52 UTC

CVE-2026-92707 · 31 Oct 2026 01:52:30 UTC

CVE-2026-92707 · 29 Oct 2026 18:29:26 UTC

CVE-2026-92707 · 28 Oct 2026 19:55:37 UTC

CVE-2026-92707 · 27 Oct 2026 15:46:19 UTC

CVE-2026-92707 · 27 Oct 2026 00:23:05 UTC

CVE-2026-92707 · 25 Oct 2026 15:18:41 UTC

CVE-2026-92707 · 25 Oct 2026 02:24:38 UTC

CVE-2026-92707 · 23 Oct 2026 16:01:26 UTC

Immutable source observations

9 recorded revisions

Each citation identifies one complete source statement. Source modification dates and the time this installation observed them are distinct. Latest history includes records historically associated by source identifiers; a removed alias is not a current equivalence claim. Exact citations show that source record's own earlier observations. Failed reads and unchanged polls do not rewrite history.

7 Nov 2026 15:25:30 UTC

MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.303 and 3.1.9, deserializing attacker-controlled MessagePack data as System.Object through PrimitiveObjectFormatter can cause excessive memory allocation. The formatter all…

euvd · EUVD-2026-102315 · Published

5 Nov 2026 14:41:07 UTC

MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.303 and 3.1.9, deserializing attacker-controlled MessagePack data as System.Object through PrimitiveObjectFormatter can cause excessive memory allocation. The formatter all…

euvd · EUVD-2026-102315 · Published

3 Nov 2026 14:03:39 UTC

MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.303 and 3.1.9, deserializing attacker-controlled MessagePack data as System.Object through PrimitiveObjectFormatter can cause excessive memory allocation. The formatter all…

euvd · EUVD-2026-102315 · Published

1 Nov 2026 13:04:34 UTC

MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.303 and 3.1.9, deserializing attacker-controlled MessagePack data as System.Object through PrimitiveObjectFormatter can cause excessive memory allocation. The formatter all…

euvd · EUVD-2026-102315 · Published

30 Oct 2026 12:53:36 UTC

MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.303 and 3.1.9, deserializing attacker-controlled MessagePack data as System.Object through PrimitiveObjectFormatter can cause excessive memory allocation. The formatter all…

euvd · EUVD-2026-102315 · Published

28 Oct 2026 10:36:28 UTC

MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.303 and 3.1.9, deserializing attacker-controlled MessagePack data as System.Object through PrimitiveObjectFormatter can cause excessive memory allocation. The formatter all…

euvd · EUVD-2026-102315 · Published

25 Oct 2026 16:19:22 UTC

MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.303 and 3.1.9, deserializing attacker-controlled MessagePack data as System.Object through PrimitiveObjectFormatter can cause excessive memory allocation. The formatter all…

nvd · CVE-2026-92707 · Published

23 Oct 2026 16:01:25 UTC

MessagePack: Nested arrays can blow past buffer length limits

osv · GHSA-qhrr-8q5h-9q3h · Published

23 Oct 2026 15:48:27 UTC

MessagePack: Nested arrays can blow past buffer length limits

cve-program · CVE-2026-92707 · Published

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