Out-of-bounds write in FreeRDP - #VU146579
Published: September 1, 2026
Vulnerability identifier: #VU146579
CSH Severity: Low
CVSS v4: 7.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to out-of-bounds write in ChannelPduTracker_poll() in libfreerdp/utils/channel_pdu_tracker.c when processing oversized SHOW_PROTOCOL static virtual-channel messages. A remote user can send a specially crafted channel message to execute arbitrary code.
On assertion-enabled builds, the same input aborts the process instead. The out-of-bounds write requires channel_pdu_tracker.c to be built with NDEBUG and without WITH_VERBOSE_WINPR_ASSERT.
Affected software
FreeRDP
Remediation
Install security update from vendor's website.
FreeRDP - update to 3.31.0