{"id":"CVE-2026-109246","title":"FreeRDP before 3.32.0 contains a divide-by-zero vulnerability in the freerdp-shadow-cli shadow server: the frame id in a client's Frame Acknowledge PDU is stored without a range check, so the in-flight frame count in shadow_encoder_infli…","summary":"FreeRDP before 3.32.0 contains a divide-by-zero vulnerability in the freerdp-shadow-cli shadow server: the frame id in a client's Frame Acknowledge PDU is stored without a range check, so the in-flight frame count in shadow_encoder_infli…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-191","CWE-369"],"vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","affected":["enterprise_linux 10","enterprise_linux 6","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9"],"published":"2026-10-12","updated":"2026-10-14","sourceUpdated":"2026-10-14T20:11:45.520","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109246","references":[{"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6vjv-4hm3-6698","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/freerdp-before-3.32.0-shadow-server-divide-by-zero-via-frame-acknowledge-pdu","label":"disclosure@vulncheck.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-109246.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-109246"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2549822"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-109246"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109246"}],"tags":["nvd","csaf","vex","red-hat","cve.org","exploit-available"],"epss":0.00379,"epssPercentile":0.31696,"ingestedAt":"2026-10-12T18:00:08.174Z","exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-18T11:48:28.697951Z"},"slug":"CVE-2026-109246","body":"## Overview\n\nFreeRDP before 3.32.0 contains a divide-by-zero vulnerability in the freerdp-shadow-cli shadow server: the frame id in a client's Frame Acknowledge PDU is stored without a range check, so the in-flight frame count in shadow_encoder_inflight_frames() can underflow. An authenticated client can acknowledge a frame id one greater than the last frame sent, causing shadow_encoder_create_frame_id() to divide by zero (SIGFPE) and terminate the process, disconnecting all viewers.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-13 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-109246.json)","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":224401,"id":"CVE-2026-109246","ts":1792327399103,"field":"exploit_available","old":"false","new":"true"}]}