CVE-2026-55827 | THREATINT

Description

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.

PUBLISHED Reserved 2026-06-17 | Published 2026-07-10 | Updated 2026-07-10 | Assigner GitHub_M

HIGH: 7.5CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Problem types

CWE-131: Incorrect Calculation of Buffer Size

CWE-787: Out-of-bounds Write

Product status

< 3.27.1

affected

References

github.com/...reeRDP/security/advisories/GHSA-c495-h83v-3prp exploit

github.com/...reeRDP/security/advisories/GHSA-c495-h83v-3prp

github.com/FreeRDP/FreeRDP/pull/12899

github.com/...ommit/e58adf922ea4c0d5495e59a1fe488d70092e0e3e

github.com/FreeRDP/FreeRDP/releases/tag/3.27.1

cve.org (CVE-2026-55827)

nvd.nist.gov (CVE-2026-55827)

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