CVE-2026-23732— FreeRDP has heap-buffer-overflow in Glyph_Alloc
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I. Basic Information for CVE-2026-23732
Vulnerability Information
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Vulnerability Title
FreeRDP has heap-buffer-overflow in Glyph_Alloc
Source: NVD (National Vulnerability Database)
Vulnerability Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, FastGlyph parsing trusts `cbData`/remaining length and never validates against the minimum size implied by `cx/cy`. A malicious server can trigger a client‑side global buffer overflow, causing a crash (DoS). 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
堆缓冲区溢出
Source: NVD (National Vulnerability Database)
Vulnerability Title
FreeRDP 安全漏洞
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之前版本存在安全漏洞，该漏洞源于FastGlyph解析信任cbData且未根据cx和cy验证最小大小，可能导致全局缓冲区溢出，进而引发崩溃。
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-2026-23732
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- Heap-buffer-overflow in Glyph_Alloc · Advisory · FreeRDP/FreeRDP · GitHubx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2026-23732
Same Patch Batch · FreeRDP · 2026-01-19 · 8 CVEs total
| CVE-2026-23884 | Heap-use-after-free in gdi_set_bounds | |
| CVE-2026-23883 | Heap-use-after-free in update_pointer_new | |
| 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
Same weakness: CWE-122
- CVE-2026-8261
Squirrel sqobject.cpp Load heap-based overflow - CVE-2026-8213
OSGeo gdal Grid File GDapi.c GDSDfldsrch heap-based overflow - CVE-2026-8212
OSGeo gdal SWapi.c SWSDfldsrch heap-based overflow - CVE-2026-42309
Pillow: Heap buffer overflow with nested list coordinates - CVE-2026-45130
Vim: Heap Buffer Overflow in spell file loading
V. Comments for CVE-2026-23732
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