Bug 2533954 (CVE-2026-91950)

Summary: CVE-2026-91950 FreeRDP: FreeRDP: Out-of-bounds read leads to denial of service or information disclosure
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in FreeRDP, where an out-of-bounds read vulnerability exists in the rdpdr_dump_packet function. This is due to a 32-bit unsigned integer wraparound during buffer bounds validation. A malicious RDP server can send a specially crafted RDPDR packet, bypassing security checks and causing the client to read memory beyond the intended buffer. This can result in client crashes, leading to a denial of service, or the disclosure of sensitive heap memory information in logs. Exploitation requires the client to have WLOG_TRACE-level logging enabled.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2534068, 2534069    
Bug Blocks:    

Description OSIDB Bzimport 2026-09-15 15:52:12 UTC 
FreeRDP before 3.31.0 contains an out-of-bounds read vulnerability in the rdpdr_dump_packet function due to 32-bit unsigned integer wraparound in buffer bounds validation. A malicious RDP server can send a crafted RDPDR packet with computerNameLen set to 0xFFFFFFF0 to bypass bounds checks and trigger memory reads past the packet buffer, causing client crashes or heap disclosure in logs.