🛡️ CVE-2026-44421 — freerdp

🟠 CVSS 8.8 — High ⚠️ Exploit Public CWE-122 NVD
8.8
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2026-44421 is classified as CWE-122: Heap-based Buffer Overflow. A write past the end of a heap allocation corrupts allocator metadata or neighbouring objects.

Affected software

CVE-2026-44421 is recorded against 2 packages.

  • freerdp (fixed in 3.26.0)
  • unknown

Timeline and source

Published on 29 May 2026 and last revised on 27 July 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

github.com
access.redhat.com
access.redhat.com
access.redhat.com
bugzilla.redhat.com
github.com
security.access.redhat.com

CVE-2026-44421 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 8.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE CWE-122
Public Exploit ⚠️ Yes
Source NVD
Published 2026-05-29
Updated 2026-08-11
Modified 2026-07-27
Fix URL N/A

Affected Packages

Software From version Fixed in
freerdp 3.26.0
unknown

Similar Threats

Exploit Protection

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CVE-2026-44421 carries CVSS 8.8 High rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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