Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-27015— FreeRDP: Smartcard NDR Alignment Padding Triggers Reachable WINPR_ASSERT Abort (Client DoS)

Quick assessment

Affected
FreeRDP FreeRDP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.26% · P18

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-27015

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
FreeRDP: Smartcard NDR Alignment Padding Triggers Reachable WINPR_ASSERT Abort (Client DoS)
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
可达断言
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
FreeRDP FreeRDP < 3.23.0 -

II. Public POCs for CVE-2026-27015

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-27015

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-27015 (1)

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-2026-26986 5.5 MEDIUM FreeRDP has heap-use-after-free in rail_window_free
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-2026-27950 FreeRDP heap-use-after-free in update_pointer_new(SDL): Fix Applied in the Wrong File

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-617

V. Comments for CVE-2026-27015

No comments yet

Leave a comment