{"id":"CVE-2026-55827","aliases":["GHSA-c495-h83v-3prp"],"url":"https://o3.security/vulnerability/CVE-2026-55827","summary":"FreeRDP: Heap out-of-bounds write in RemoteFX (RFX) Cache Bitmap V3 decode","details":"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":"2026-07-10T19:47:03.498Z","modified":"2026-08-12T03:51:46.805385672Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[],"fix":{"url":"https://github.com/FreeRDP/FreeRDP/commit/e58adf922ea4c0d5495e59a1fe488d70092e0e3e","label":"FreeRDP/FreeRDP@e58adf9"},"references":[{"type":"WEB","url":"https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55827.json"},{"type":"ADVISORY","url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-c495-h83v-3prp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55827"},{"type":"FIX","url":"https://github.com/FreeRDP/FreeRDP/commit/e58adf922ea4c0d5495e59a1fe488d70092e0e3e"},{"type":"FIX","url":"https://github.com/FreeRDP/FreeRDP/pull/12899"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:46.805385672Z"}}