CVE-2026-31883— FreeRDP has a `size_t` underflow in ADPCM decoder leads to heap-buffer-overflow write

FreeRDP has a `size_t` underflow in ADPCM decoder leads to heap-buffer-overflow write

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, a size_t underflow in the IMA-ADPCM and MS-ADPCM audio decoders leads to heap-buffer-overflow write via the RDPSND audio channel. In libfreerdp/codec/dsp.c, the IMA-ADPCM and MS-ADPCM decoders subtract block header sizes from a size_t variable without checking for underflow. When nBlockAlign (received from the server) is set such that size % block_size == 0 triggers the header parsing at a point where size is smaller than the header (4 or 8 bytes), the subtraction wraps size to ~SIZE_MAX. The while (size > 0) loop then continues for an astronomical number of iterations. This vulnerability is fixed in 3.24.0.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

整数下溢(超界折返)

FreeRDP 数字错误漏洞

FreeRDP是FreeRDP团队的一款开源的远程桌面协议（RDP）的实现。 FreeRDP 3.24.0之前版本存在数字错误漏洞，该漏洞源于IMA-ADPCM和MS-ADPCM音频解码器中存在size_t下溢，可能导致通过RDPSND音频通道进行堆缓冲区溢出写入。

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