{"id":"CVE-2026-78450","aliases":["EUVD-2026-73801","GHSA-63ph-mjfv-6m29"],"status":"published","title":"Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability","description":"Use after free in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over a network.","severity":{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00707,"percentile":0.53877,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-416"],"published":"2026-09-08T17:18:23Z","modified":"2026-11-10T21:37:24Z","products":[{"vendor":"microsoft","product":"windows 10 version 1809"},{"vendor":"microsoft","product":"windows server 2019"},{"vendor":"microsoft","product":"windows server 2019 (server core installation)"},{"vendor":"microsoft","product":"windows server 2022"},{"vendor":"microsoft","product":"windows server 2025"},{"vendor":"microsoft","product":"windows server 2025 (server core installation)"},{"vendor":"microsoft","product":"windows_10_1809"},{"vendor":"microsoft","product":"windows_server_2019"},{"vendor":"microsoft","product":"windows_server_2022"},{"vendor":"microsoft","product":"windows_server_2025"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78450","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-78450"},{"url":"https://github.com/advisories/GHSA-63ph-mjfv-6m29"}],"sources":{"cve":[{"id":"CVE-2026-78450","title":"Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability","description":"Use after free in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-09-08T17:18:23.871Z","modified":"2026-11-10T21:37:24.163Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-416"],"updated_at":"2026-11-10T22:48:53.557052Z"}],"euvd":[{"id":"EUVD-2026-73801","description":"Use after free in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-09-08T17:18:23Z","modified":"2026-11-10T21:37:24Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-10T23:24:19.311812Z"}],"ghsa":[{"id":"GHSA-63ph-mjfv-6m29","title":"Use after free in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to...","description":"Use after free in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-09-08T18:33:24Z","modified":"2026-09-08T18:33:37Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T15:11:33.442964Z"}],"nvd":[{"id":"CVE-2026-78450","description":"Use after free in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-09-08T18:20:43.34Z","modified":"2026-09-16T20:30:36.543Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:12:45.264578Z"}]}}