CVE-2026-55827CWE-131CWE-787

FreeRDP: Heap out-of-bounds write in RemoteFX (RFX) Cache Bitmap V3 decode

High · published July 10, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
44.2
In the wild
Unconfirmed
What it is

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.1, FreeRDP clients launched with the non-default /cache:codec:rfx option pass desktop stride and height to RemoteFX decoding for Cache Bitmap V3 data while allocating bitmap->data only for the smaller DstWidth and DstHeight in gdi_Bitmap_Decompress, allowing a malicious RDP server to trigger a heap out-of-bounds write with attacker-controlled offset and content. This issue is fixed in version 3.27.1.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00533 · 44.2th percentile
Weaknesses
CWE-131 · Incorrect Calculation of Buffer Size; CWE-787 · Out-of-bounds Write
Published
2026-07-10T19:47Z
EPSS history
Timeline
  • 10 JUL 19:47Z
    FreeRDP: Heap out-of-bounds write in RemoteFX (RFX) Cache Bitmap V3 decode
    cvelistv5