CVE-2026-55827
FreeRDP is a free implementation of the Remote Desktop Protocol.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.34%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 0.34% probability · 27th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-131, CWE-787
- Affected
- freerdp/freerdp
- Source
- security-advisories@github.com
References
- https://github.com/FreeRDP/FreeRDP/commit/e58adf922ea4c0d5495e59a1fe488d70092e0e3ePatch
- 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-3prpExploit, Mitigation, Vendor Advisory
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-c495-h83v-3prpExploit, Mitigation, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.