Bug 2442748 (CVE-2026-27015)

Summary: CVE-2026-27015 freerdp: FreeRDP: Denial of Service via missing bounds check in smartcard redirection
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in FreeRDP, a free implementation of the Remote Desktop Protocol. A malicious Remote Desktop Protocol (RDP) server can exploit a missing bounds check vulnerability in the smartcard redirection feature. This can lead to a client crash, resulting in a Denial of Service (DoS) for the FreeRDP client when smartcard redirection is explicitly enabled.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2442847, 2442852, 2442859, 2442861, 2442863    
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Description OSIDB Bzimport 2026-02-25 21:02:43 UTC
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.