CVE-2026-44420

HIGH 8.8

FreeRDP cliprdr server heap-buffer-overflow via undersized capabilitySetLength in CB_CLIP_CAPS

CVSS Score

8.8

EPSS Score

3.5%

EPSS Percentile

88th

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP client can trigger a heap-buffer-overflow write in FreeRDP's server-side clipboard (cliprdr) channel by sending a CB_CLIP_CAPS PDU with a too-small capabilitySetLength. This can crash the server process (remote DoS) and may be exploitable for code execution because it corrupts heap memory. This vulnerability is fixed in 3.26.0.

CWE	CWE-122
Vendor	freerdp
Product	freerdp
Published	May 29, 2026
Last Updated	Jul 17, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

FreeRDP / FreeRDP

< 3.26.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mvpx-xj7r-3p3r github.com: https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-h6wq-j5mv-f3q8 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-44420 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2483480 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44420.json access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36203