🛡️ OESA-2026-1516 — freerdp (CVE-2026-22852 +25 more)

freerdp security update

FreeRDP is a client implementation of the Remote Desktop Protocol (RDP) that follows Microsoft's

open specifications. This package provides the client applications xfreerdp.

Security Fix(es):

A malicious server can trigger a client-side heap buffer overflow, causing a crash (DoS) and potential heap corruption with code-execution risk depending on allocator behavior and surrounding heap layout.(CVE-2026-22852)

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.20.1, a heap out-of-bounds read occurs in the smartcard SetAttrib path when the cbAttrLen parameter does not match the actual NDR (Network Data Representation) buffer length. An attacker could potentially exploit this vulnerability to read sensitive information from process memory or cause the application to crash.(CVE-2026-22855)

A malicious server can trigger a client-side use after free, causing a crash (DoS) and potential heap corruption with code-execution risk depending on allocator behavior and surrounding heap layout.(CVE-2026-22856)

A malicious server can trigger a client-side heap buffer overflow, causing a crash (DoS) and potential heap corruption with code-execution risk depending on allocator behavior and surrounding heap layout. The vulnerability exists in the irp_thread_func function.(CVE-2026-22857)

A malicious server can trigger a client‑side heap buffer overflow, causing a crash (DoS) and potential heap corruption with code‑execution risk depending on allocator behavior and surrounding heap layout.(CVE-2026-22859)

A heap-based buffer overflow vulnerability exists in FreeRDP within the planar_decompress_plane_rle function, which may lead to memory corruption and arbitrary code execution.(CVE-2026-23530)

FreeRDP is a free implementation of the Remote Desktop Protocol (RDP). Prior to version 3.21.0, a heap buffer overflow vulnerability existed in the ClearCodec component. Specifically, when glyphData is present, the clear_decompress function calls freerdp_image_copy_no_overlap without validating the destination rectangle. This allows for out-of-bounds read/write operations when processing crafted RDPGFX surface updates. A malicious server can exploit this to trigger a client-side heap buffer overflow, causing a crash (Denial of Service) and potential heap corruption. Depending on allocator behavior and surrounding heap layout, there is a risk of arbitrary code execution.(CVE-2026-23531)

A heap-buffer-overflow vulnerability exists in FreeRDP software that could allow an attacker to execute arbitrary code or cause denial of service on affected systems. This vulnerability affects the gdi_SurfaceToSurface function and is present in versions 3.20.2 and earlier.(CVE-2026-23532)

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, a client-side heap buffer overflow vulnerability exists in the RDPGFX ClearCodec decode path, specifically in the clear_decompress_residual_data function. When processing maliciously crafted residual data, out-of-bounds writes occur during color output. A malicious server can exploit this to trigger a client-side heap buffer overflow, causing a crash (Denial of Service) and potential heap corruption. Depending on allocator behavior and surrounding heap layout, there is a risk of arbitrary code execution.(CVE-2026-23533)

FreeRDP is a free implementation of the Remote Desktop Protocol (RDP). Prior to version 3.21.0, a client-side heap buffer overflow vulnerability exists in the ClearCodec bands decode path. When a malicious server sends crafted band coordinates, it allows writes past the end of the destination surface buffer. This can be exploited to trigger a client-side heap buffer overflow, causing a crash (Denial of Service) and potentially leading to heap corruption with the risk of arbitrary code execution, depending on allocator behavior and surrounding heap layout.(CVE-2026-23534)

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, the FastGlyph parsing process trusts cbData/remaining length but never validates it against the minimum size implied by cx/cy. A malicious server can exploit this vulnerability to trigger a client-side global heap buffer overflow, causing a crash and resulting in a denial of service.(CVE-2026-23732)

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, the xf_Pointer_New function frees the cursorPixels memory on failure. Subsequently, the pointer_free function calls xf_Pointer_Free, which attempts to free the same memory again, triggering an AddressSanitizer (ASan) detected use-after-free (UAF). A malicious server can trigger a client-side use-after-free, causing a crash (Denial of Service) and potentially leading to heap corruption with a risk of code execution, depending on allocator behavior and surrounding heap layout.(CVE-2026-23883)

FreeRDP is a free implementation