What is CVE-2026-44421?

CVE-2026-44421 is a high-severity vulnerability in Freerdp, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-05-29.

How severe is CVE-2026-44421?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Freerdp

CVE-2026-44421

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP server can trigger a heap-buffer-overflow write in the FreeRDP client by sending crafted RDPGFX PDUs. The bug is in gdi_CacheToSurface: it va…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (17.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Freerdp — versions < 3.26.0

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-44421?: CVE-2026-44421 is a high-severity vulnerability in Freerdp, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-05-29.
How severe is CVE-2026-44421?: High severity. CVSS v3 base score is 8.8 out of 10.