CVE-2026-57158

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 planar_decompress_plane_rle_only in libfreerdp/codec/planar.c, allowing a malicious RDP server to send a truncated RDPGFX_CMDID_WIRETOSURFACE_1 planar payload that reads one byte past the input buffer. This issue is fixed in version 3.28.0.

• CVE-2026-57158: fix 1-byte out-of-bounds heap read in planar_decompress_plane_rle_only; move the input-buffer bounds check ahead of the control-byte read so a truncated RLE plane payload is rejected before dereferencing past the input buffer

These are all security issues fixed in the freerdp-3.28.0-1.1 package on the GA media of openSUSE Tumbleweed.

This update for freerdp fixes the following issues:

• CVE-2026-27951: 32-bit system denial of service via endless blocking loop in Stream_EnsureCapacity (bsc#1258939).
• CVE-2026-33952: client denial of service via unvalidated authentication length field (bsc#1261196).
• CVE-2026-33977: client denial of service via malformed IMA ADPCM audio data (bsc#1261198).
• CVE-2026-33982: heap buffer overread in winpr_aligned_offset_recalloc() can lead to undefined behavior (bsc#1261222).
• CVE-2026-33983: improper error handling can lead to use of incorrect shift exponent, undefined behavior and an 80 billion iteration loop (bsc#1261200).
• CVE-2026-33984: heap buffer overflow allows arbitrary code execution via crafted pixel data (bsc#1261211).
• CVE-2026-33985: heap out-of-bounds read can leak sensitive data when pixel data is rendered to screen (bsc#1261217).
• CVE-2026-33986: heap out-of-bounds write due to H.264 YUV buffer dimension desync (bsc#1261223).
• CVE-2026-33987: heap out-of-bounds write due to persistent cache bmpSize desync (bsc#1261226).
• CVE-2026-33995: double-free in kerberos_AcceptSecurityContext() and kerberos_InitializeSecurityContextA() can lead to crash during NLA connection teardown with a failed authentication attempt (bsc#1261227).
• CVE-2026-40033: heap buffer overflow in gdi_CacheToSurface allows attackers to cause a denial of service or achieve remote code execution (bsc#1266317).
• CVE-2026-40254: off-by-one error in contains_dotdot() allows for drive channel path traversal (bsc#1262743).
• CVE-2026-44420: heap buffer overwrite can be triggered in server-side clipboard channel when a malicious client sends a CB_CLIP_CAPS PDU with a too-small capabilitySetLength (bsc#1267008).
• CVE-2026-44421: improper validation in gdi_CacheToSurface can lead to a heap buffer overwrite client when an RDP server sends crafted RDPGFX PDUs (bsc#1267009).
• CVE-2026-44422: improper memory management can lead to heap use-after-free/double-free in a client's RDPEAR authentication-redirection path (bsc#1267010).
• CVE-2026-45700: data check bypass when decoding RLE planar data can lead to an out-of-bounds heap write (bsc#1267011).
• CVE-2026-56297: improper synchronization of channel_callback access can lead to use-after-free in dvcman_channel_close and dvcman_call_on_receive triggered by a malicious RDP server (bsc#1271071).
• CVE-2026-57156: integer overflow in update_read_delta_points allows malicious RDP peers to cause a heap buffer overflow (bsc#1271303).
• CVE-2026-57157: 2-byte heap out-of-bounds read via attacker-supplied MS-RDPECAM DeviceName and VirtualChannelName fields (bsc#1271304).
• CVE-2026-57158: incomplete fix for CVE-2026-23530 in planar_decompress_plane_rle_only allows a malicious RDP server to trigger a one byte buffer overflow via a truncated RDPGFX_CMDID_WIRETOSURFACE_1 planar payload (bsc#1271305).

It was discovered that FreeRDP contained multiple security issues. An attacker could possibly use these issues to obtain sensitive information, cause FreeRDP to crash, resulting in a denial of service, or execute arbitrary code.