{"id":"CVE-2026-55193","title":"FreeRDP is a free implementation of the Remote Desktop Protocol","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 without bounding it to the 4088-byte …","severity":"high","cwe":["CWE-122","CWE-120"],"published":"2026-08-19","updated":"2026-09-09","sourceUpdated":"2026-09-09T21:19:49.197","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55193","references":[{"url":"https://github.com/FreeRDP/FreeRDP/commit/a863ef1cf1cdabf9019280e5658f806e73bb50e8","label":"security-advisories@github.com"},{"url":"https://github.com/FreeRDP/FreeRDP/pull/12873","label":"security-advisories@github.com"},{"url":"https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.0","label":"security-advisories@github.com"},{"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-7rp4-66mc-j9vx","label":"security-advisories@github.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55193.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-55193"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2519818"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-55193"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55193"},{"url":"https://access.redhat.com/errata/RHSA-2026:66349"},{"url":"https://access.redhat.com/errata/RHSA-2026:66347"},{"url":"https://access.redhat.com/errata/RHSA-2026:69387"}],"tags":["nvd","csaf","vex","red-hat"],"epss":0.00489,"epssPercentile":0.41197,"ingestedAt":"2026-09-09T21:22:45.541Z","vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream (v. 9)","affected":["enterprise_linux 6","enterprise_linux 7","enterprise_linux 8","enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_9","enterprise_linux_codeready_linux_builder_v_10","enterprise_linux_codeready_linux_builder_v_9"],"patched":["enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_9","enterprise_linux_codeready_linux_builder_v_10","enterprise_linux_codeready_linux_builder_v_9"],"cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvssSource":"vendor","slug":"CVE-2026-55193","body":"## Overview\n\nFreeRDP 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:66349** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66349)\n- **RHSA-2026:66347** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66347)\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55193.json)\n- **RHSA-2026:69387** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69387)","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}