{"id":"CVE-2026-55193","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-55193","summary":"FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, FreeRDP clients using TS Gateway accept a server-controlled max_xmit_frag value in libfreerdp/core/gateway/rpc_bind.c…","details":"FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, FreeRDP clients using TS Gateway accept a server-controlled max_xmit_frag value in libfreerdp/core/gateway/rpc_bind.c without bounding it to the 4088-byte ReceiveFragment allocation. A malicious gateway can advertise 65535 and then send a response fragment of the same length, causing rpc_channel_read in libfreerdp/core/gateway/rpc.c to write up to 65535 bytes into the smaller ReceiveFragment buffer. This can crash the client and may permit code execution through attacker-controlled heap corruption. This issue is fixed in version 3.27.0.","published":"2026-08-19T18:16:44.720","modified":"2026-08-19T18:16:44.720","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/FreeRDP/FreeRDP/commit/a863ef1cf1cdabf9019280e5658f806e73bb50e8","label":"FreeRDP/FreeRDP@a863ef1"},"references":[{"type":"WEB","url":"https://github.com/FreeRDP/FreeRDP/commit/a863ef1cf1cdabf9019280e5658f806e73bb50e8"},{"type":"WEB","url":"https://github.com/FreeRDP/FreeRDP/pull/12873"},{"type":"WEB","url":"https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.0"},{"type":"WEB","url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-7rp4-66mc-j9vx"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-19T18:16:44.720"}}