{"id":"CVE-2023-40518","aliases":["EUVD-2023-45089","GHSA-qg79-g97j-8qg5"],"status":"published","title":"LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.","description":"LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00652,"percentile":0.51705,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2023-08-14T00:00:00Z","modified":"2026-10-28T02:30:33Z","products":[{"vendor":"litespeedtech","product":"openlitespeed"}],"references":[{"url":"https://www.litespeedtech.com/products/litespeed-web-server/release-log","tags":["x_transferred","Release Notes","web"]},{"url":"https://openlitespeed.org/release-log/version-1-7-x/","tags":["x_transferred","Release Notes","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-40518","tags":["advisory"]},{"url":"https://openlitespeed.org/release-log/version-1-7-x"},{"url":"https://github.com/advisories/GHSA-qg79-g97j-8qg5"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/40xxx/CVE-2023-40518.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2023-40518","description":"LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.","status":"published","published":"2023-08-14T00:00:00Z","modified":"2024-10-09T15:47:00.349Z","updated_at":"2026-11-02T14:35:21.971258Z"}],"euvd":[{"id":"EUVD-2023-45089","description":"LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.","status":"published","published":"2023-08-14T00:00:00Z","modified":"2024-10-09T15:47:00Z","updated_at":"2026-11-03T00:27:43.39457Z"}],"ghsa":[{"id":"GHSA-qg79-g97j-8qg5","title":"LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.","description":"LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.","status":"published","published":"2023-08-15T00:31:21Z","modified":"2024-04-04T06:57:21Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T14:56:47.061253Z"}],"nvd":[{"id":"CVE-2023-40518","description":"LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.","status":"published","published":"2023-08-14T22:15:14.327Z","modified":"2026-06-17T06:18:17.707Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary"}],"updated_at":"2026-11-02T14:08:24.487686Z"}],"osv":[{"id":"CVE-2023-40518","description":"LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.","status":"published","published":"2023-08-14T00:00:00Z","modified":"2026-10-28T02:30:33.266549039Z","updated_at":"2026-11-02T15:44:33.244128Z"}]}}