{"id":"CVE-2026-55194","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, rpc_client_recv_fragment in libfreerdp/core/gateway/rpc_client.c ensures the response reassembly stream capacity using only the server-declared alloc_hint …","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-122","CWE-120"],"vendor":"freerdp","product":"freerdp","affected":["freerdp < 3.27.0"],"patched":["freerdp 3.27.0"],"published":"2026-08-19","updated":"2026-09-24","sourceUpdated":"2026-09-24T15:15:35.073","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55194","references":[{"url":"https://github.com/FreeRDP/FreeRDP/commit/9f2da52c2341cc14a96ad12e69c5b83d0bcd8b5a","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-9gxm-3mf5-f5cx","label":"security-advisories@github.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55194.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-55194"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2519824"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-55194"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55194"},{"url":"https://access.redhat.com/errata/RHSA-2026:68707"},{"url":"https://access.redhat.com/errata/RHSA-2026:68706"},{"url":"https://access.redhat.com/errata/RHSA-2026:61378"},{"url":"https://access.redhat.com/errata/RHSA-2026:62571"},{"url":"https://access.redhat.com/errata/RHSA-2026:65855"},{"url":"https://access.redhat.com/errata/RHSA-2026:66281"},{"url":"https://access.redhat.com/errata/RHSA-2026:66282"},{"url":"https://access.redhat.com/errata/RHSA-2026:61379"},{"url":"https://access.redhat.com/errata/RHSA-2026:71390"},{"url":"https://access.redhat.com/errata/RHSA-2026:71388"},{"url":"https://access.redhat.com/errata/RHSA-2026:71387"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"epss":0.00619,"epssPercentile":0.49454,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-08-21T03:55:49.884406Z"},"scores":{"nvd":9.8,"cna":8.7,"vendor":8.8},"ingestedAt":"2026-09-13T18:54:55.030Z","slug":"CVE-2026-55194","body":"## Overview\n\nFreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, rpc_client_recv_fragment in libfreerdp/core/gateway/rpc_client.c ensures the response reassembly stream capacity using only the server-declared alloc_hint rather than the actual StubLength about to be written. A malicious TS Gateway can send a PTYPE_RESPONSE with a small alloc_hint and a much larger frag_length, causing Stream_Write to copy attacker-controlled stub data beyond the 4096-byte pdu->s buffer. This can crash the client and may permit code execution through heap corruption. This issue is fixed in version 3.27.0.\n\n## Affected\n\n- `freerdp < 3.27.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `freerdp 3.27.0`\n\n## Vendor advisories\n\n- **RHSA-2026:68707** · Red Hat · fixed in: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68707)\n- **RHSA-2026:68706** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68706)\n- **RHSA-2026:61378** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61378)\n- **RHSA-2026:62571** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-09-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:62571)\n- **RHSA-2026:65855** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) · released 2026-09-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:65855)\n- **RHSA-2026:66281** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66281)\n- **RHSA-2026:66282** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66282)\n- **RHSA-2026:61379** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61379)\n- **RHSA-2026:71390** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-09-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:71390)\n- **RHSA-2026:71388** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-09-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:71388)\n- **RHSA-2026:71387** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat CodeReady Linux Builder EUS (v.9.6) · released 2026-09-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:71387)","depth":"abyssal","depthScore":66,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":210176,"id":"CVE-2026-55194","ts":1790264791871,"field":"cvss","old":"8.7","new":"9.8"},{"seq":210175,"id":"CVE-2026-55194","ts":1790264791871,"field":"severity","old":"high","new":"critical"},{"seq":33563,"id":"CVE-2026-55194","ts":1789010689982,"field":"cvss","old":null,"new":"8.8"},{"seq":33562,"id":"CVE-2026-55194","ts":1789010689982,"field":"severity","old":"none","new":"high"}]}