{"id":"CVE-2026-56179","aliases":["EUVD-2026-56763","GHSA-rxw5-jh43-59h9"],"status":"published","title":"Windows Network Address Translation (NAT) Spoofing Vulnerability","description":"Origin validation error in Windows Network Address Translation (NAT) allows an unauthorized attacker to perform spoofing over an adjacent network.","severity":{"version":"3.1","score":8.3,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00276,"percentile":0.20238,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-346"],"published":"2026-08-11T17:07:10Z","modified":"2026-11-10T22:00:59Z","products":[{"vendor":"microsoft","product":"windows 11 version 24h2"},{"vendor":"microsoft","product":"windows 11 version 25h2"},{"vendor":"microsoft","product":"windows 11 version 26h1"},{"vendor":"microsoft","product":"windows server 2025"},{"vendor":"microsoft","product":"windows server 2025 (server core installation)"},{"vendor":"microsoft","product":"windows_11_24h2"},{"vendor":"microsoft","product":"windows_11_25h2"},{"vendor":"microsoft","product":"windows_11_26h1"},{"vendor":"microsoft","product":"windows_server_2025"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56179","tags":["vendor-advisory","patch","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56179"},{"url":"https://github.com/advisories/GHSA-rxw5-jh43-59h9"}],"sources":{"cve":[{"id":"CVE-2026-56179","title":"Windows Network Address Translation (NAT) Spoofing Vulnerability","description":"Origin validation error in Windows Network Address Translation (NAT) allows an unauthorized attacker to perform spoofing over an adjacent network.","status":"published","published":"2026-08-11T17:07:10.631Z","modified":"2026-11-10T22:00:59.724Z","cvss":[{"version":"3.1","score":8.3,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-346"],"updated_at":"2026-11-10T23:49:29.755102Z"}],"euvd":[{"id":"EUVD-2026-56763","description":"Origin validation error in Windows Network Address Translation (NAT) allows an unauthorized attacker to perform spoofing over an adjacent network.","status":"published","published":"2026-08-11T17:07:10Z","modified":"2026-11-10T22:00:59Z","cvss":[{"version":"3.1","score":8.3,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-10T23:24:16.163953Z"}],"ghsa":[{"id":"GHSA-rxw5-jh43-59h9","title":"Origin validation error in Windows Network Address Translation (NAT) allows an unauthorized...","description":"Origin validation error in Windows Network Address Translation (NAT) allows an unauthorized attacker to perform spoofing over an adjacent network.","status":"published","published":"2026-08-11T18:30:58Z","modified":"2026-08-11T18:31:04Z","cvss":[{"version":"3.1","score":8.3,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T15:10:18.151039Z"}],"nvd":[{"id":"CVE-2026-56179","description":"Origin validation error in Windows Network Address Translation (NAT) allows an unauthorized attacker to perform spoofing over an adjacent network.","status":"published","published":"2026-08-11T17:18:04.363Z","modified":"2026-08-13T14:17:01.747Z","cvss":[{"version":"3.1","score":8.3,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T14:12:36.499002Z"}]}}