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FreeRDP freerdpFreeRDP planar_decompress_plane_rle_only: heap OOB read — incomplete fix for CVE-2026-23530

Risk 66
Severity
5.1
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

FreeRDP is a free implementation of the Remote Desktop Protocol. From 3.21.0 before 3.28.0, FreeRDP clients using the GFX pipeline contain an incomplete fix for CVE-2026-23530 in planardecompressplanerleonly in libfreerdp/codec/planar.c, allowing a malicious RDP server to send a truncated RDPGFXCMDIDWIRETOSURFACE1 planar payload that reads one byte past the input buffer. This issue is fixed in version 3.28.0.

First published (updated )
CVE-2026-57158

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