Use-after-free in FreeRDP - CVE-2026-121955
Published: November 10, 2026 / Updated: November 11, 2026
Vulnerability identifier: #VU164431
CSH Severity: Medium
CVSS v4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-121955
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to corrupt heap state or crash the FreeRDP client.
The vulnerability exists due to use-after-free in smartcard emulation when ReleaseContext frees contexts and handles before worker threads are cancelled and joined. A remote attacker can send smartcard IRPs to establish a context and release it during GetStatusChange or LOCATECARDSBYATRA processing, or race handle operations such as Status and Transmit, to access freed memory when /smartcard and FreeRDP_SmartcardEmulation are enabled.
Affected software
FreeRDP
How to mitigate CVE-2026-121955
Install security update from vendor's website.
FreeRDP - update to 3.32.2