FreeRDP: Smartcard NDR Alignment Padding Triggers Reachable WINPR_ASSERT Abort (Client DoS)
Summary
FreeRDP: Smartcard NDR Alignment Padding Triggers Reachable WINPR_ASSERT Abort (Client DoS)
Original description
The description as published by the source.
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: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-27015 freerdp2
- Ubuntu UBUNTU-CVE-2026-27015 freerdp
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- patch github.com