Description
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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
FreeRDP FreeRDP
< 3.26.0affected
References
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-p6r2-4hgm-m6ff ↗
- 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 ↗
- https://access.redhat.com/errata/RHSA-2026:46393 ↗
- https://access.redhat.com/errata/RHSA-2026:36203 ↗