CVE-2026-23530 Details
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.
A heap buffer overflow vulnerability has been identified in FreeRDP, a free implementation of the Remote Desktop Protocol, in versions prior to 3.21.0. The issue arises in the function 'freerdp_bitmap_decompress_planar', which fails to properly validate the source width and height against the maximum allowed dimensions before performing Run-Length Encoding (RLE) decoding. This lack of validation allows a malicious server to send a planar bitmap that exceeds the client's capacity, leading to a buffer overflow. Such exploitation can cause a crash, create heap corruption, and potentially allow for arbitrary code execution, depending on the behavior of the memory allocator and the layout of the heap.
Users can upgrade to FreeRDP version 3.21.0 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jan 20, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-122 | Heap-based Buffer Overflow | redhat-SADP |
| CWE-122 | Heap-based Buffer Overflow | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| freerdp freerdp | < 3.21.0 |
CPE
Remediation
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Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 15, 2026 | CVE Modified | redhat-SADP |
| Jun 30, 2026 | CVE Modified | redhat-SADP |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jan 28, 2026 | Initial Analysis | [email protected] |
| Jan 19, 2026 | New CVE Received | [email protected] |