High [CVE-2026-55827] Remote code execution via heap out-of-bounds write in RemoteFX decoding
This high-severity Red Hat Linux advisory covers CVE-2026-55827 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
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Summary
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. A flaw was found in FreeRDP.
This can lead to arbitrary code execution on the client system. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H).
Weakness: CWE-787. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7.
Red Hat lists Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7.
Red Hat fixing advisory: RHSA-2026:50747, RHSA-2026:54667.
Affected products named by the advisory: Red Hat package: freerdp.
- < 3.27.1
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
- 3.27.1
- freerdp-2:3.10.3-12.el10_2.7
- freerdp-2:3.10.3-3.el10_0.10
- RHSA-2026:50747
- RHSA-2026:54667
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
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