CVE-2026-44420
FreeRDP cliprdr server heap-buffer-overflow via undersized capabilitySetLength in CB_CLIP_CAPS
- State
- Published
- Severity
- 8.8 High
- Published
- May 29, 2026
- Updated
- Jul 27, 2026
- Reserved
- May 6, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | GitHub_M |
| 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | redhat-SADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
FreeRDPFreeRDP |
|
References
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mvpx-xj7r-3p3r
- https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-h6wq-j5mv-f3q8exploit
- https://access.redhat.com/security/cve/CVE-2026-44420vdb-entry
- RHBZ#2483480issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44420.json
- https://access.redhat.com/errata/RHSA-2026:46393vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36203vendor-advisory
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