2565951 – (CVE-2026-121404) CVE-2026-121404 freerdp: freerdp: Denial of Service via zero-length dynamic virtual channel messages

Bug 2565951 (CVE-2026-121404) - CVE-2026-121404 freerdp: freerdp: Denial of Service via zero-length dynamic virtual channel messages

Summary: CVE-2026-121404 freerdp: freerdp: Denial of Service via zero-length dynamic v...

Keywords:
Status:	NEW
Alias:	CVE-2026-121404
Product:	Security Response
Classification:	Other
Component:	vulnerability
Sub Component:
Version:	unspecified
Hardware:	All
OS:	Linux
Priority:	medium
Severity:	medium
Target Milestone:	---
Assignee:	Product Security DevOps Team
QA Contact:
Docs Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+	depends on / blocked

Reported:	2026-11-03 16:46 UTC by OSIDB Bzimport
Modified:	2026-11-04 08:34 UTC (History)
CC List:	2 users (show)
Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments	(Terms of Use)

Description OSIDB Bzimport 2026-11-03 16:46:46 UTC

FreeRDP before 3.32.2 contains a denial of service vulnerability in the shadow server that allows authenticated RDP clients to spin server threads by sending zero-length drdynvc DATA PDUs. Attackers can send empty DATA messages on opened audin or rdpgfx channels, so that FreeRDP_WTSVirtualChannelRead never consumes them, consuming full CPU cores until disconnect.

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