CVE-2026-44421 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-44421HIGH

FreeRDP RDPGFX CacheToSurface heap-buffer-overflow via clamped-rectangle validation bypass

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  U  H  H  H    8.8   .0051   41.2     —

AFFECTED
  Product  Versions    Fixed
  FreeRDP  < 3.26.0 –  —

TIMELINE
  May 6   Reserved by GitHub_M
  May 29  EXPLOIT PUBLISHED — CVE-2026-44421 (FreeRDP). Public exploit reference added.
  May 29  Published (CNA: GitHub_M)
  Jul 27  EXPLOIT PUBLISHED — CVE-2026-44421 (FreeRDP). Public exploit reference added.

CWE-122, CWE-787 · CNA: GitHub_M · CVSS v3.1 · 6 references · NVD status: Modified

Description

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 validates a destination rectangle that is clamped to UINT16_MAX, but then performs the copy using the original cacheEntry->width/height. This can cause a large out-of-bounds heap write and may lead to client crashes or code execution. This bug is reachable from a malicious RDP server, but only when the client has RDPGFX enabled. This vulnerability is fixed in 3.26.0.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
May 6, 2026	Reserved	Reserved by GitHub_M
May 29, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-44421 (FreeRDP). Public exploit reference added.
May 29, 2026	Published	Published (CNA: GitHub_M)
July 27, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-44421 (FreeRDP). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
FreeRDP	FreeRDP	—	< 3.26.0	—

Weaknesses

CWE-122 · CWE-787

References (6)

Authoritative record: CVE-2026-44421 at cve.org

Vendors: freerdp

Weaknesses: CWE-122 · CWE-787

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-44421 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.