CVE-2026-23883— Heap-use-after-free in update_pointer_new
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I. Basic Information for CVE-2026-23883
Vulnerability Information
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Vulnerability Title
Heap-use-after-free in update_pointer_new
Source: NVD (National Vulnerability Database)
Vulnerability Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, `xf_Pointer_New` frees `cursorPixels` on failure, then `pointer_free` calls `xf_Pointer_Free` and frees it again, triggering ASan UAF. 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. Version 3.21.0 contains a patch for the issue.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
释放后使用
Source: NVD (National Vulnerability Database)
Vulnerability Title
FreeRDP 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeRDP是FreeRDP团队的一款开源的远程桌面协议（RDP）的实现。 FreeRDP 3.21.0之前版本存在资源管理错误漏洞，该漏洞源于xf_Pointer_New函数在失败时释放cursorPixels，随后pointer_free再次调用xf_Pointer_Free并释放它，可能导致释放后重用，造成崩溃和潜在的堆损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-23883
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Same Patch Batch · FreeRDP · 2026-01-19 · 8 CVEs total
| CVE-2026-23884 | Heap-use-after-free in gdi_set_bounds | |
| CVE-2026-23732 | FreeRDP has heap-buffer-overflow in Glyph_Alloc | |
| CVE-2026-23534 | FreeRDP has heap-buffer-overflow in clear_decompress_bands_data | |
| CVE-2026-23533 | FreeRDP has heap-buffer-overflow in clear_decompress_residual_data | |
| CVE-2026-23532 | FreeRDP has heap-buffer-overflow in gdi_SurfaceToSurface | |
| CVE-2026-23531 | FreeRDP has heap-buffer-overflow in clear_decompress | |
| CVE-2026-23530 | FreeRDP has heap-buffer-overflow in planar_decompress_plane_rle |
IV. Related Vulnerabilities
Same product: FreeRDP
- CVE-2026-40254
FreeRDP: contains_dotdot() off-by-one allows drive channel p - CVE-2026-33995
FreeRDP: Possible double free in kerberos_AcceptSecurityCont - CVE-2026-33987
FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write - CVE-2026-33986
FreeRDP: H.264 YUV Buffer Dimension Desync - Heap OOB Write - CVE-2026-33985
FreeRDP: ClearCodec Glyph Cache Count Desync - Heap OOB Read
Same vendor: FreeRDP
- CVE-2026-40254
FreeRDP: contains_dotdot() off-by-one allows drive channel p - CVE-2026-33995
FreeRDP: Possible double free in kerberos_AcceptSecurityCont - CVE-2026-33987
FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write - CVE-2026-33986
FreeRDP: H.264 YUV Buffer Dimension Desync - Heap OOB Write - CVE-2026-33985
FreeRDP: ClearCodec Glyph Cache Count Desync - Heap OOB Read
V. Comments for CVE-2026-23883
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