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ALSA-2026:3067 — Important: freerdp security update

Affected: AlmaLinux:9: freerdp, AlmaLinux:9: freerdp-devel, AlmaLinux:9: freerdp-libs, AlmaLinux:9: libwinpr, AlmaLinux:9: libwinpr-devel

FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. The xfreerdp client can connect to RDP servers such as Microsoft Windows machines, xrdp, and VirtualBox.

Security Fix(es):

* freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22855) * freerdp: FreeRDP global-buffer-overflow (CVE-2026-22858) * freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22859)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

bdu:2026-00620

EUVD-2026-355319

fkie_cve-2026-22858

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, global-buffer-overflow was observed in FreeRDP's Base64 decoding path. The root cause appears to be implementation-defined char signedness: on Arm/AArch64 builds, plain char is treated as unsigned, so the guard c <= 0 can be optimized into a simple c != 0 check. As a result, non-ASCII bytes (e.g., 0x80-0xFF) may bypass the intended range restriction and be used as an index into a global lookup table, causing out-of-bounds access. This vulnerability is fixed in 3.20.1.

OESA-2026-3853 — freerdp security update

Affected: openEuler:24.03-LTS-SP4: freerdp

FreeRDP is a client implementation of the Remote Desktop Protocol (RDP) that follows Microsoft&apos;s open specifications. This package provides the client applications xfreerdp. Security Fix(es):

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.20.1, a global-buffer-overflow vulnerability was observed in FreeRDP's Base64 decoding path. The root cause is the implementation-defined signedness of the `char` type: on Arm/AArch64 builds, plain `char` is treated as unsigned, causing the guard condition `c <= 0` to potentially be optimized by the compiler into a simple `c != 0` check. Consequently, non-ASCII bytes (e.g., 0x80-0xFF) may bypass the intended range restriction and be used as an index into a global lookup table, resulting in out-of-bounds access. A malicious server can exploit this to trigger a client-side crash, leading to a denial of service.(CVE-2026-22858)

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, FreeRDP's planar bitmap decoder has an out-of-bounds heap write when decoding RLE planar data. In libfreerdp/codec/planar.c, freerdp_bitmap_decompress_planar() validates the X destination coordinate nXDst against the caller-provided destination stride (nDstStep) even when it is writing into the internal temp buffer pTempData. An attacker can bypass the check with a large nDstStep and a large nXDst, causing planar_decompress_plane_rle() to write past the end of pTempData. This…

openSUSE-SU-2026:10059-1 — freerdp-3.20.2-1.1 on GA media

freerdp-3.20.2-1.1 on GA media

RHSA-2026:19033 — Red Hat Security Advisory: freerdp security update

freerdp: FreeRDP heap-buffer-overflow freerdp: FreeRDP heap-buffer-overflow freerdp: FreeRDP heap-buffer-overflow freerdp: FreeRDP heap-buffer-overflow freerdp: FreeRDP heap-use-after-free freerdp: FreeRDP global-buffer-overflow freerdp: FreeRDP heap-buffer-overflow freerdp: FreeRDP: Denial of Service via FastGlyph parsing buffer overflow freerdp: FreeRDP has a NULL Pointer Dereference in rdp_write_logon_info_v2() freerdp: FreeRDP has a heap-use-after-free in video_timer freerdp: FreeRDP has a Heap-use-after-free in urb_select_interface freerdp: FreeRDP: Denial of Service via use-after-free in AUDIN format renegotiation freerdp: FreeRDP: Denial of Service via use after free in ecam_channel_write freerdp: FreeRDP has a heap-buffer-overflow in urb_select_interface freerdp: FreeRDP has a heap-use-after-free in urb_bulk_transfer_cb freerdp: FreeRDP has a Heap-buffer-overflow in audio_formats_free freerdp: FreeRDP has a heap-use-after-free in ainput_send_input_event freerdp: FreeRDP has a Heap-use-after-free in play_thread freerdp: FreeRDP: Arbitrary code execution via heap buffer overflow in GDI surface pipeline freerdp: FreeRDP: Arbitrary code execution via heap out-of-bounds write in RLE planar decode path freerdp: FreeRDP: Arbitrary code execution via crafted Remote Desktop Protocol (RDP) server messages FreeRDP: FreeRDP: Denial of Service via specially crafted Remote Desktop Protocol messages FreeRDP: FreeRDP: Heap buffer overflow allows arbitrary code execution via crafted…

UBUNTU-CVE-2026-22858

Affected: Ubuntu:16.04:LTS: freerdp, Ubuntu:Pro:18.04:LTS: freerdp2, Ubuntu:18.04:LTS: freerdp, Ubuntu:Pro:20.04:LTS: freerdp2, Ubuntu:22.04:LTS: freerdp2, Ubuntu:24.04:LTS: freerdp3, Ubuntu:Pro:24.04:LTS: freerdp2, Ubuntu:25.10: freerdp3, Ubuntu:26.04:LTS: freerdp3

WID-SEC-W-2026-0111 — FreeRDP: Mehrere Schwachstellen

Ein entfernter Angreifer kann mehrere Schwachstellen in FreeRDP ausnutzen,um möglicherweise einen Denial-of-Service-Zustand zu verursachen, beliebigen Code auszuführen, Daten zu manipulieren oder vertrauliche Informationen offenzulegen.