Integer overflow in FreeRDP - CVE-2026-55648
Published: June 15, 2026 / Updated: August 21, 2026
Vulnerability identifier: #VU134504
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-55648
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause an out-of-bounds read.
The vulnerability exists due to integer overflow in freerdp_image_copy_from_icon_data() when processing a crafted RAIL icon update PDU. A remote attacker can send a specially crafted icon update with attacker-controlled dimensions and pixel data to cause an out-of-bounds read.
Only FreeRDP-based clients running in RAIL/Remote App mode are affected; desktop mode sessions are not affected.
Affected software
FreeRDP
Fedora
freerdp
Fedora
freerdp
How to mitigate CVE-2026-55648
Install security update from vendor's website.
FreeRDP - update to 3.27.0
freerdp - addressed in versions 3.27.1-1.fc43, 3.27.1-1.fc44
freerdp - addressed in versions 3.27.1-1.fc43, 3.27.1-1.fc44