CVE-2026-55827
FreeRDP: Heap out-of-bounds write in RemoteFX (RFX) Cache Bitmap V3 decode
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-131 CWE-787 |
| Vendor | freerdp |
| Product | freerdp |
| Published | Jul 10, 2026 |
| Last Updated | Jul 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
FreeRDP / FreeRDP
< 3.27.1
References
github.com: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-c495-h83v-3prp github.com: https://github.com/FreeRDP/FreeRDP/pull/12899 github.com: https://github.com/FreeRDP/FreeRDP/commit/e58adf922ea4c0d5495e59a1fe488d70092e0e3e github.com: https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.1