{"id":"CVE-2017-20190","aliases":["EUVD-2017-11182","GHSA-6399-j99h-665c"],"status":"disputed","title":"Some Microsoft technologies as used in Windows 8 through 11 allow a temporary client-side...","description":"Some Microsoft technologies as used in Windows 8 through 11 allow a temporary client-side performance degradation during processing of multiple Unicode combining characters, aka a \"Zalgo text\" attack. NOTE: third parties dispute whether the computational cost of interpreting Unicode data should be considered a vulnerability.","epss":{"day":"2026-11-08","score":0.00262,"percentile":0.18088,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-176"],"published":"2024-03-26T00:00:00Z","modified":"2026-06-17T01:15:22Z","products":[{"vendor":"microsoft","product":"windows"}],"references":[{"url":"https://talk.dynalist.io/t/dynalist-is-vulnerable-to-zalgo/1234","tags":["x_transferred"]},{"url":"https://en.wikipedia.org/wiki/Zalgo_text","tags":["x_transferred"]},{"url":"https://aka.ms/windowsbugbar","tags":["x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2017-20190"},{"url":"https://github.com/advisories/GHSA-6399-j99h-665c"}],"sources":{"cve":[{"id":"CVE-2017-20190","description":"Some Microsoft technologies as used in Windows 8 through 11 allow a temporary client-side performance degradation during processing of multiple Unicode combining characters, aka a \"Zalgo text\" attack. NOTE: third parties dispute whether the computational cost of interpreting Unicode data should be considered a vulnerability.","status":"disputed","published":"2024-03-26T00:00:00Z","modified":"2024-08-08T18:54:20.251Z","cwes":["CWE-176"],"updated_at":"2026-11-02T14:33:11.928814Z"}],"euvd":[{"id":"EUVD-2017-11182","description":"Some Microsoft technologies as used in Windows 8 through 11 allow a temporary client-side performance degradation during processing of multiple Unicode combining characters, aka a \"Zalgo text\" attack. NOTE: third parties dispute whether the computational cost of interpreting Unicode data should be considered a vulnerability.","status":"published","published":"2024-03-26T00:00:00Z","modified":"2024-08-08T18:54:20Z","updated_at":"2026-11-03T00:56:21.653692Z"}],"ghsa":[{"id":"GHSA-6399-j99h-665c","title":"Some Microsoft technologies as used in Windows 8 through 11 allow a temporary client-side...","description":"Some Microsoft technologies as used in Windows 8 through 11 allow a temporary client-side performance degradation during processing of multiple Unicode combining characters, aka a \"Zalgo text\" attack. NOTE: third parties dispute whether the computational cost of interpreting Unicode data should be considered a vulnerability.","status":"published","published":"2024-03-27T00:30:57Z","modified":"2024-08-08T21:32:00Z","cwes":["CWE-176"],"updated_at":"2026-11-02T14:57:54.57979Z"}],"nvd":[{"id":"CVE-2017-20190","description":"Some Microsoft technologies as used in Windows 8 through 11 allow a temporary client-side performance degradation during processing of multiple Unicode combining characters, aka a \"Zalgo text\" attack. NOTE: third parties dispute whether the computational cost of interpreting Unicode data should be considered a vulnerability.","status":"disputed","published":"2024-03-27T00:15:07.58Z","modified":"2026-06-17T01:15:22.267Z","cwes":["CWE-176"],"updated_at":"2026-11-02T14:04:21.492973Z"}]}}