Bug 2565962 (CVE-2026-121394)

Summary: CVE-2026-121394 freerdp: FreeRDP: Denial of Service via assertion failure in RemoteFX decoder
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in FreeRDP. This vulnerability allows a malicious Remote Desktop Protocol (RDP) server to cause a Denial of Service (DoS) by crashing the connected client. When a user connects to an attacker-controlled server with RemoteFX decoding enabled, the server can transmit a specially crafted graphics stream. This triggers an internal assertion failure in the decoder, causing the client application to terminate abruptly.
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:

Description OSIDB Bzimport 2026-11-03 16:59:16 UTC
FreeRDP from 3.11.0 before 3.32.2 contains an assertion failure in the RemoteFX RLGR decoder that allows malicious servers to terminate clients. Attackers controlling an RDP server can send a RemoteFX tileset with RLGR code 32767, triggering a signed narrowing assertion in rfx_rlgr_decode and crashing the client.