Bug 2549766 (CVE-2026-109257)

Summary: CVE-2026-109257 freerdp: freerdp: Denial of Service via double-free in NSCodec
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in FreeRDP. A remote attacker using a specially crafted Remote Desktop Protocol (RDP) client can request NSCodec compression with large display dimensions to trigger a memory allocation failure on the server. Because the server fails to properly clear memory pointers during error handling, this condition causes a double-free memory error during session cleanup. Consequently, an attacker can crash the server process, resulting in a Denial of Service (DoS).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-10-12 16:45:13 UTC 
FreeRDP before 3.32.0 contains a double-free vulnerability in nsc_context_initialize_encode() that leaves dangling plane pointers after a partial buffer growth failure. Attackers using a crafted RDP client can negotiate NSCodec with a large desktop geometry to trigger allocation failure, crashing the server during context teardown.