Out-of-bounds read in FreeRDP - #VU137828
Published: July 16, 2026
Vulnerability identifier: #VU137828
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-125
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 out-of-bounds read in update_process_glyph_fragments() and glyph_cache_fragment_put() when processing GLYPH_FRAGMENT_ADD data from an RDP server. A remote attacker can send a short GLYPH_FRAGMENT_ADD payload with a larger declared fragment size to cause a denial of service.
The demonstrated impact is a client-side crash, and no attacker-controlled write primitive, remote code execution, or direct information disclosure beyond the out-of-bounds read was confirmed.
Remediation
Install security update from vendor's website.