CVE-2026-33983 FreeRDP: Progressive Codec Quant BYTE Underflow - UB + CPU DoS

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, progressivedecompresstileupgrade detects a mismatch via progressiverfxquantcmpequal but only emits WLogWARN, execution continues. The wrapped value 247 is used as a shift exponent, causing undefined behavior...

CVE-2026-33983

FreeRDP (Remote Desktop Protocol) exhibits a CPU denial-of-service vulnerability in progressive_decompress_tile_upgrade() due to a mismatch detected by progressive_rfx_quant_cmp_equal(), where the wrapped value (247) is used as a shift exponent. This causes undefined behavior and can trigger an e...