CVE-2026-22853
FreeRDP has a heap-buffer-overflow in ndr_read_uint8Array
- State
- Published
- Severity
- 6.8 Medium
- Published
- Jan 14, 2026
- Updated
- Aug 19, 2026
- Reserved
- Jan 12, 2026
Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, RDPEAR’s NDR array reader does not perform bounds checking on the on‑wire element count and can write past the heap buffer allocated from hints, causing a heap buffer overflow in ndr_read_uint8Array. This vulnerability is fixed in 3.20.1.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.8 Medium | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P | GitHub_M |
| 3.1 | 8.1 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | redhat-SADP |
Weaknesses
- CWE-787 Out-of-bounds Write
Affected Products
| Product | Versions |
|---|---|
FreeRDPFreeRDP |
|
References
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-47v9-p4gp-w5ch
- https://github.com/FreeRDP/FreeRDP/releases/tag/3.20.1
- https://access.redhat.com/security/cve/CVE-2026-22853vdb-entry
- RHBZ#2429647issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22853.json
- https://access.redhat.com/errata/RHSA-2026:4121vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3068vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19033vendor-advisory
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