Description
FreeRDP before 3.26.0 contains a heap-buffer-overflow vulnerability in gdi_CacheToSurface that allows remote attackers to write out-of-bounds heap memory. The vulnerability occurs because rectangle validation clamps coordinates to UINT16_MAX but performs copy operations using unclamped cache entry dimensions, enabling malicious RDP servers to trigger large out-of-bounds writes and potentially achieve remote code execution or client crash.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
FreeRDP FreeRDP
Default version status: unaffected
0 to < 3.26.0affected3.26.0unaffected
References
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-p6r2-4hgm-m6ff ↗
- https://github.com/FreeRDP/FreeRDP/pull/12713 ↗
- https://github.com/FreeRDP/FreeRDP/commit/d7508ebcd82842a691ae4941e5104d14240a89ae ↗
- https://www.vulncheck.com/advisories/freerdp-heap-buffer-overflow-in-gdi-cachetosurface-via-rectangle-validation-bypass ↗
- https://access.redhat.com/security/cve/CVE-2026-40033 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=2481473 ↗
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40033.json ↗
- https://access.redhat.com/errata/RHSA-2026:46393 ↗
- https://access.redhat.com/errata/RHSA-2026:36203 ↗