Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Freerdp | Freerdp | < 3.27.1 |
Related Weaknesses (CWE)
References
- https://github.com/FreeRDP/FreeRDP/commit/e58adf922ea4c0d5495e59a1fe488d70092e0ePatch
- https://github.com/FreeRDP/FreeRDP/pull/12899Patch
- https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.1Release Notes
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-c495-h83v-3prpExploitMitigationVendor Advisory
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-c495-h83v-3prpExploitMitigationVendor Advisory
FAQ
What is CVE-2026-55827?
CVE-2026-55827 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 decod...
How severe is CVE-2026-55827?
CVE-2026-55827 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-55827?
Check the references section above for vendor advisories and patch information. Affected products include: Freerdp Freerdp.