CVE-2026-23530
Critical
Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0,`freerdp_bitmap_decompress_planar` does not validate `nSrcWidth`/`nSrcHeight` against `planar->maxWidth`/`maxHeight` before RLE decode. A malicious server can trigger a client‑side heap buffer overflow, causing a crash (DoS) and potential heap corruption with code‑execution risk depending on allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.
SeverityCritical
CVSS9.8
Exploit probability—
ProductFreerdp
PublishedJan 19, 2026
First seenJan 19, 2026
Weakness typeCWE-122CWE-122
How to fix
Update
- freerdp freerdp3.21.0 or later
Vendor advisories
- access.redhat.com/errata/RHSA-2026:2714
- access.redhat.com/errata/RHSA-2026:2952
- access.redhat.com/errata/RHSA-2026:2222
- access.redhat.com/errata/RHSA-2026:2081
- access.redhat.com/errata/RHSA-2026:3039
- access.redhat.com/errata/RHSA-2026:3038
- access.redhat.com/errata/RHSA-2026:3036
- access.redhat.com/errata/RHSA-2026:3041
- access.redhat.com/errata/RHSA-2026:2770
- access.redhat.com/errata/RHSA-2026:2824
- access.redhat.com/errata/RHSA-2026:2736
- access.redhat.com/errata/RHSA-2026:3037
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| freerdp freerdp | v < 3.21.0 | 3.21.0 |
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