High 8.8Published May 29, 2026

CVE-2026-44421FreeRDP RDPGFX CacheToSurface heap-buffer-overflow via clamped-rectangle validation bypass

Updated under an hour ago (Oct 28, 2026, 9:40 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for FreeRDP

Exploited in the last 30 days

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP server can trigger a heap-buffer-overflow write in the FreeRDP client by sending crafted RDPGFX PDUs. The bug is in gdi_CacheToSurface: it validates a destination rectangle that is clamped to UINT16_MAX, but then performs the copy using the original cacheEntry->width/height. This can cause a large out-of-bounds heap write and may lead to client crashes or code execution. This bug is reachable from a malicious RDP server, but only when the client has RDPGFX enabled. This vulnerability is fixed in 3.26.0.

CVSS: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-122, CWE-787
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Modified
Record last updated: Jul 27, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

FreeRDP FreeRDP freerdp:freerdp (from the name)	before 3.26.0	CNA record
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 2:3.10.3-12.el10_2.6 not affected	CISA ADP
freerdp freerdp freerdp:freerdp	before 3.26.0	NVD

References

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-p6r2-4hgm-m6ff	x-refsource-confirm, exploit, mitigation, vendor-advisory
https://access.redhat.com/errata/RHSA-2026:36203
https://access.redhat.com/errata/RHSA-2026:46393
https://access.redhat.com/security/cve/CVE-2026-44421
https://bugzilla.redhat.com/show_bug.cgi?id=2483471
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44421.json

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.