Reachable assertion in FreeRDP - CVE-2026-91959
Published: September 1, 2026 / Updated: September 16, 2026
Vulnerability identifier: #VU146594
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-91959
CWE-ID: CWE-617
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to reachable assertion in rts_read_result() in libfreerdp/core/gateway/rts.c when parsing a truncated BIND_ACK result list sent by an RD Gateway over the RPC-over-HTTP transport. A remote attacker can send a specially crafted BIND_ACK fragment to cause a denial of service.
User interaction is required to induce the victim to connect through an attacker-controlled gateway, such as via a crafted .rdp file or link.
Affected software
FreeRDP
openEuler
freerdp
libwinpr-devel
libwinpr
freerdp-help
freerdp-devel
freerdp-debugsource
freerdp-debuginfo
openEuler
freerdp
libwinpr-devel
libwinpr
freerdp-help
freerdp-devel
freerdp-debugsource
freerdp-debuginfo
How to mitigate CVE-2026-91959
Install security update from vendor's website.
FreeRDP - update to 3.31.0
freerdp - update to 2.11.8-11
libwinpr-devel - update to 2.11.8-11
libwinpr - update to 2.11.8-11
freerdp-help - update to 2.11.8-11
freerdp-devel - update to 2.11.8-11
freerdp-debugsource - update to 2.11.8-11
freerdp-debuginfo - update to 2.11.8-11
freerdp - update to 2.11.8-11
libwinpr-devel - update to 2.11.8-11
libwinpr - update to 2.11.8-11
freerdp-help - update to 2.11.8-11
freerdp-devel - update to 2.11.8-11
freerdp-debugsource - update to 2.11.8-11
freerdp-debuginfo - update to 2.11.8-11