CVE-2026-23530 — Heap-based Buffer Overflow in Freerdp

CWE-122 — Heap-based Buffer Overflow7 documents6 sources
Severity
7.7HIGHNVD
EPSS
0.2%
top 63.89%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
FreerdpDebian Freerdp2Debian Freerdp3
Timeline
PublishedJan 19
Latest updateMar 18

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.

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Affected Packages3 packages

▶NVDfreerdp/freerdp< 3.21.0
▶debiandebian/freerdp2< freerdp3 3.21.0+dfsg-1 (forky)
▶debiandebian/freerdp3< freerdp3 3.21.0+dfsg-1 (forky)

🔴Vulnerability Details

1
OSV
CVE-2026-23530: FreeRDP is a free implementation of the Remote Desktop Protocol↗2026-01-19
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📋Vendor Advisories

4
Ubuntu
FreeRDP vulnerabilities↗2026-03-18
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Ubuntu
FreeRDP vulnerabilities↗2026-02-03
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Red Hat
freerdp: FreeRDP: Heap buffer overflow leading to denial of service and potential code execution from a malicious server.↗2026-01-19
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Debian
CVE-2026-23530: freerdp2 - FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to versio...↗2026
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🕵️Threat Intelligence

1
Wiz
CVE-2026-23530 Impact, Exploitability, and Mitigation Steps | Wiz↗
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