Integer underflow in FreeRDP - CVE-2026-29776
Published: April 8, 2026
Vulnerability identifier: #VU125362
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-29776
CWE-ID: CWE-191
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: FreeRDP
Affected software:
FreeRDP
FreeRDP
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to integer underflow in update_read_cache_bitmap_order() in libfreerdp/core/orders.c when processing a crafted bitmap cache order from the network. A remote attacker can send a specially crafted RDP update that causes excessive memory allocation and process termination to cause a denial of service.
User interaction is required, and exploitation occurs in the client while handling server-supplied RDP data.
How to mitigate CVE-2026-29776
Install security update from vendor's website.