CVE-2026-27015— FreeRDP: Smartcard NDR Alignment Padding Triggers Reachable WINPR_ASSERT Abort (Client DoS)
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I. Basic Information for CVE-2026-27015
Vulnerability Information
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Vulnerability Title
FreeRDP: Smartcard NDR Alignment Padding Triggers Reachable WINPR_ASSERT Abort (Client DoS)
Source: NVD (National Vulnerability Database)
Vulnerability Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, a missing bounds check in `smartcard_unpack_read_size_align()` (`libfreerdp/utils/smartcard_pack.c:1703`) allows a malicious RDP server to crash the FreeRDP client via a reachable `WINPR_ASSERT` → `abort()`. The crash occurs in upstream builds where `WITH_VERBOSE_WINPR_ASSERT=ON` (default in FreeRDP 3.22.0 / current WinPR CMake defaults). Smartcard redirection must be explicitly enabled by the user (e.g., `xfreerdp /smartcard`; `/smartcard-logon` implies `/smartcard`). Version 3.23.0 fixes the issue.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
可达断言
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 3.23.0之前版本存在安全漏洞，该漏洞源于smartcard_unpack_read_size_align中缺少边界检查，可能导致客户端崩溃。
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-2026-27015
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Same Patch Batch · FreeRDP · 2026-02-25 · 15 CVEs total
| CVE-2026-26955 | 8.8 HIGH | FreeRDP has Out-of-bounds Write |
| CVE-2026-26965 | 8.8 HIGH | FreeRDP has Out-of-bounds Write |
| CVE-2026-27951 | 5.3 MEDIUM | FreeRDP has possible Integer overflow in Stream_EnsureCapacity |
| CVE-2026-25941 | 4.3 MEDIUM | FreeRDP: vuln_1_15_1 RDPGFX WIRE_TO_SURFACE_2 Out-of-Bounds Read |
| CVE-2026-25942 | FreeRDP has global-buffer-overflow in xf_rail_server_execute_result | |
| CVE-2026-25953 | FreeRDP has heap-use-after-free in xf_AppUpdateWindowFromSurface (freed appWindow) | |
| CVE-2026-25952 | FreeRDP has heap-use-after-free in xf_SetWindowMinMaxInfo | |
| CVE-2026-26271 | Buffer Overread in FreeRDP Icon Processing | |
| CVE-2026-25959 | FreeRDP has heap-use-after-free in xf_cliprdr_provide_data_ | |
| CVE-2026-25997 | FreeRDP has heap-use-after-free in xf_clipboard_format_equal | |
| CVE-2026-25955 | FreeRDP has heap-use-after-free in xf_AppUpdateWindowFromSurface (stale XImage) | |
| CVE-2026-25954 | FreeRDP has heap-use-after-free in xf_rail_server_local_move_size | |
| CVE-2026-26986 | FreeRDP has heap-use-after-free in rail_window_free | |
| CVE-2026-27950 | FreeRDP heap-use-after-free in update_pointer_new(SDL): Fix Applied in the Wrong File |
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-617
- CVE-2026-41584
ZEBRA: rk Identity Point Panic in Transaction Verification - CVE-2026-20450
Qualcomm Modem MSV-6100远程拒绝服务漏洞 - CVE-2026-41485
Kyverno Controller Denial of Service via forEach Mutation Pa - CVE-2026-34067
nimiq-transaction vulnerable to panic via `HistoryTreeProof` - CVE-2026-34063
network-libp2p: Peer can crash the node by opening discovery
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