Bug 2519817 (CVE-2026-55191) - CVE-2026-55191 FreeRDP: FreeRDP: Arbitrary code execution via heap-buffer-overflow in AVC444 YUV buffer allocation
Summary: CVE-2026-55191 FreeRDP: FreeRDP: Arbitrary code execution via heap-buffer-ove...
Keywords:
Status: NEW
Alias: CVE-2026-55191
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2521929 2521933 2521931
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-19 17:56 UTC by OSIDB Bzimport
Modified: 2026-08-24 14:05 UTC (History)
2 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-08-19 17:56:55 UTC 
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, FreeRDP clients that negotiate RDPGFX AVC444 with an H.264 decoder backend calculate the intermediate YUV444 allocation size in libfreerdp/codec/h264.c with 32-bit multiplication in avc444_ensure_buffer. A malicious RDP server can supply surface dimensions for which piDstStride multiplied by padDstHeight wraps to a small nonzero value, causing winpr_aligned_recalloc to allocate an undersized buffer before YUV420CombineToYUV444 writes using the actual stride and rectangle dimensions. This can cause a client crash and may permit code execution through attacker-influenced heap corruption. This issue is fixed in version 3.27.0.
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