Bug 2509996 (CVE-2026-67306)

Summary: CVE-2026-67306 FreeRDP: FreeRDP: Out-of-bounds read vulnerability via crafted RDP messages
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. An out-of-bounds read vulnerability exists in the RDP6 planar RLE bitmap decoder. A malicious or compromised Remote Desktop Protocol (RDP) server can send a specially crafted bitmap or surface update. This can cause the client to read beyond the intended memory buffer, potentially leading to a denial of service (client crash) or the disclosure of sensitive information.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2510302, 2510303    
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Description OSIDB Bzimport 2026-08-01 13:02:23 UTC 
FreeRDP versions 3.28.0 and earlier contain an out-of-bounds read vulnerability in the RDP6 planar RLE bitmap decoder functions planar_decompress_plane_rle and planar_decompress_plane_rle_only in libfreerdp/codec/planar.c. Only the 1-byte control byte is bounds-checked; the subsequent 0–15 attacker-declared raw bytes are read without validating that the source buffer contains them. A malicious or compromised RDP server can send a truncated planar-encoded bitmap or surface update (reachable via both the Bitmap Update PDU and RDPGFX Surface Command paths) that causes the client to read past the end of the source buffer. The issue is fixed in FreeRDP 3.29.0.