{"id":"CVE-2018-12542","aliases":["GHSA-h39x-m55c-v55h"],"url":"https://o3.security/vulnerability/CVE-2018-12542","summary":"Eclipse Vert.x does not properly neutralize '' (forward slashes) sequences that can resolve to an external location","details":"In version from 3.0.0 to 3.5.3 of Eclipse Vert.x, the StaticHandler uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize '\\' (forward slashes) sequences that can resolve to a location that is outside of that directory when running on Windows Operating Systems.","published":"2018-10-10T20:29:00.553Z","modified":"2026-07-08T17:56:14.607437Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"Maven","name":"io.vertx:vertx-web","fixedVersion":"3.5.4"}],"fix":{"url":"https://github.com/vert-x3/vertx-web/commit/57a65dce6f4c5aa5e3ce7288685e7f3447eb8f3b","label":"vert-x3/vertx-web@57a65dc"},"references":[{"type":"WEB","url":"https://lists.apache.org/thread.html/rd0e44e8ef71eeaaa3cf3d1b8b41eb25894372e2995ec908ce7624d26%40%3Ccommits.pulsar.apache.org%3E"},{"type":"REPORT","url":"https://bugs.eclipse.org/bugs/show_bug.cgi?id=539171"},{"type":"EVIDENCE","url":"https://github.com/vert-x3/vertx-web/issues/1025"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2018-12542"},{"type":"WEB","url":"https://github.com/vert-x3/vertx-web/commit/57a65dce6f4c5aa5e3ce7288685e7f3447eb8f3b"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-h39x-m55c-v55h"},{"type":"PACKAGE","url":"https://github.com/vert-x3/vertx-web"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rd0e44e8ef71eeaaa3cf3d1b8b41eb25894372e2995ec908ce7624d26@%3Ccommits.pulsar.apache.org%3E"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T17:56:14.607437Z"}}