CVE-2026-44421 | BDVDB-2026-336563 Detail
FreeRDPFreeRDP
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.
Impact#
Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: network.
Weaknesses#
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
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.