Bug 2561767

Summary:	CVE-2026-92707 dotnet10.0: MessagePack: Nested arrays can blow past buffer length limits [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Vipul Nair <vinair>
Component:	dotnet10.0	Assignee:	Omair Majid <omajid>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	omajid
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["ee3a830b-deb7-420f-9b0e-f00e9a8fb799"]}
Fixed In Version:		Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2548800

Description Vipul Nair 2026-10-27 10:48:11 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

SignalR's MessagePack protocol can consume excessive memory while deserializing deeply nested attacker-controlled arrays, resulting in unauthenticated remote denial of service.

CNA: microsoft
CNA impact: Denial of Service
CWE: TBD
Platforms: all
Architectures: all
CVSS 3.1: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)

Affected packages:
- Microsoft.AspNetCore.SignalR.Protocols.MessagePack (release 10.0): 10.0.0 - 10.0.12; fixed 10.0.13 [aspnetcore@0ef4bbf]
- Microsoft.AspNetCore.SignalR.Protocols.MessagePack (release 8.0): 8.0.0 - 8.0.31; fixed 8.0.32 [aspnetcore@21f2be2]
- Microsoft.AspNetCore.SignalR.Protocols.MessagePack (release 9.0): 9.0.0 - 9.0.20; fixed 9.0.21 [aspnetcore@a0f453f]
- Microsoft.AspNetCore.SignalR.Protocols.MessagePack (release 11.0): 11.0.0-preview.5 - 11.0.0-rc.1; fixed 11.0.0-rc.2 [aspnetcore@f0abafb]

Fix commits:
- dotnet/aspnetcore (release/10.0): https://github.com/dotnet/aspnetcore/commit/0ef4bbfa3291b306a21e5001cb0491277bdd35bc
- dotnet/aspnetcore (release/8.0): https://github.com/dotnet/aspnetcore/commit/21f2be26fd214186afe5a4f75332f4ee64130700
- dotnet/aspnetcore (release/9.0): https://github.com/dotnet/aspnetcore/commit/a0f453fb54e3bea486ff0d27606bd0e579d71c88
- dotnet/aspnetcore (release/11.0): https://github.com/dotnet/aspnetcore/commit/f0abafbf4c64be4c8bbccda5b3ed80d8fc771ac2