FreeRDP is a free implementation of the Remote Desktop Protocol.
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.
AI Analysis
Technical Summary
FreeRDP clients launched with the non-default /cache:codec:rfx option prior to version 3.27.1 improperly pass desktop stride and height to RemoteFX decoding for Cache Bitmap V3 data. This causes the allocation of bitmap->data to be sized only for the smaller DstWidth and DstHeight in the gdi_Bitmap_Decompress function, enabling a malicious RDP server to trigger a heap out-of-bounds write with attacker-controlled offset and content. This vulnerability allows potential memory corruption and impacts confidentiality, integrity, and availability. The vulnerability is resolved in FreeRDP 3.27.1.
Potential Impact
A malicious RDP server can exploit this vulnerability to cause a heap out-of-bounds write in the FreeRDP client, potentially leading to arbitrary code execution or denial of service. The impact affects confidentiality, integrity, and availability of the client system. There are no known exploits in the wild at this time.
Mitigation Recommendations
This vulnerability is fixed in FreeRDP version 3.27.1. Users and administrators should upgrade to version 3.27.1 or later to remediate this issue. Patch status is confirmed by the vendor advisory indicating the fix in 3.27.1. No additional mitigations are specified.
FreeRDP is a free implementation of the Remote Desktop Protocol.
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.
CVSS v3.1
Score 7.5high
Affected software
pkg:deb/ubuntu/[email protected]~git20140921.1.440916e+dfsg1-5ubuntu1.4?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]+dfsg1-0ubuntu0.18.04.4+esm6?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~git20140921.1.440916e+dfsg1-15ubuntu1.18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]+dfsg1-0ubuntu0.20.04.2+esm4?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]+dfsg1-3ubuntu2.11?arch=source&distro=jammypkg:deb/ubuntu/[email protected]+dfsg1-0ubuntu1.6?arch=source&distro=noblepkg:deb/ubuntu/[email protected]+dfsg1-1ubuntu0.1~esm6?arch=source&distro=esm-apps/noblepkg:deb/ubuntu/[email protected]+dfsg-2ubuntu0.5?arch=source&distro=questingpkg:deb/ubuntu/[email protected]+dfsg-1ubuntu1.1?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
FreeRDP clients launched with the non-default /cache:codec:rfx option prior to version 3.27.1 improperly pass desktop stride and height to RemoteFX decoding for Cache Bitmap V3 data. This causes the allocation of bitmap->data to be sized only for the smaller DstWidth and DstHeight in the gdi_Bitmap_Decompress function, enabling a malicious RDP server to trigger a heap out-of-bounds write with attacker-controlled offset and content. This vulnerability allows potential memory corruption and impacts confidentiality, integrity, and availability. The vulnerability is resolved in FreeRDP 3.27.1.
Potential Impact
A malicious RDP server can exploit this vulnerability to cause a heap out-of-bounds write in the FreeRDP client, potentially leading to arbitrary code execution or denial of service. The impact affects confidentiality, integrity, and availability of the client system. There are no known exploits in the wild at this time.
Mitigation Recommendations
This vulnerability is fixed in FreeRDP version 3.27.1. Users and administrators should upgrade to version 3.27.1 or later to remediate this issue. Patch status is confirmed by the vendor advisory indicating the fix in 3.27.1. No additional mitigations are specified.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-55827
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 3.1
Threat ID: 6a58b47468715ace43d8d77e
Added to database: 07/16/2026, 10:37:40 UTC
Last enriched: 07/16/2026, 11:51:46 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 10
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