🛡️ CVE-2026-44421 on Ubuntu — freerdp

⚪ Unknown ✅ No Known Exploit OSV
N/A
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.

Distribution advisory

This page covers CVE-2026-44421 as tracked by Ubuntu, for the package freerdp. The fix is available in version 3.30.0+dfsg-0ubuntu0.26.04.1; earlier versions remain affected.

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.

Affected software

UBUNTU-CVE-2026-44421 is recorded against 3 packages.

  • freerdp
  • freerdp2
  • freerdp3 (fixed in 3.30.0+dfsg-0ubuntu0.26.04.1)

Timeline and source

Published on 29 May 2026 and last revised on 21 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)
github.com (Report)
ubuntu.com (Advisory)

CVE-2026-44421 on other distributions

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

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-05-29
Updated 2026-08-12
Modified 2026-07-21
Fix URL N/A

Affected Packages

Software From version Fixed in
freerdp — —
freerdp2 — —
freerdp3 — 3.30.0+dfsg-0ubuntu0.26.04.1

Similar Threats

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