Heap-based buffer overflow in FreeRDP - CVE-2026-33987
Published: April 8, 2026
Vulnerability identifier: #VU125366
CSH Severity: High
CVSS v4: 7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-33987
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service or modify data.
The vulnerability exists due to a heap-based buffer overflow in persistent_cache_read_entry_v3() in libfreerdp/cache/persistent.c when processing a crafted .bmc persistent cache file. A remote attacker can provide a specially crafted cache file to cause a denial of service or modify data.
User interaction is required to open or process the crafted persistent cache file.
Affected software
FreeRDP
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Fedora
freerdp (Red Hat package)
freerdp
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Fedora
freerdp (Red Hat package)
freerdp
How to mitigate CVE-2026-33987
Install security update from vendor's website.
FreeRDP - update to 3.24.2
freerdp (Red Hat package) - update to 3.10.3-5.el10_1.8
freerdp - addressed in versions 3.24.2-1.fc42, 3.24.2-1.fc43, 3.24.2-1.fc44
freerdp (Red Hat package) - update to 3.10.3-5.el10_1.8
freerdp - addressed in versions 3.24.2-1.fc42, 3.24.2-1.fc43, 3.24.2-1.fc44