Out-of-bounds read in FreeRDP - CVE-2026-55564
Published: June 15, 2026 / Updated: August 21, 2026
Vulnerability identifier: #VU134509
CSH Severity: Medium
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-55564
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information and cause a denial of service.
The vulnerability exists due to an out-of-bounds read in glyph_cache_get() in the glyph cache when processing crafted glyph fragments from a malicious RDP server. A remote attacker can send crafted glyph orders that cause an out-of-bounds heap read to disclose sensitive information and cause a denial of service.
User interaction is required because the victim must connect to the attacker's RDP server.
Affected software
FreeRDP
How to mitigate CVE-2026-55564
Install security update from vendor's website.
FreeRDP - update to 3.27.0