CVE-2026-55191

UNKNOWN 0.0

FreeRDP: Heap-buffer-overflow write in AVC444 YUV buffer allocation

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-122 CWE-190
Vendor	freerdp
Product	freerdp
Published	Aug 19, 2026
Last Updated	Aug 19, 2026

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Affected Versions

FreeRDP / FreeRDP

< 3.27.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-vx73-w5q6-7jqr github.com: https://github.com/FreeRDP/FreeRDP/pull/12873 github.com: https://github.com/FreeRDP/FreeRDP/commit/97f40b9e766af375f4e41ac6a3f4397d708d249c github.com: https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.0