{"id":"CVE-2026-1858","aliases":["DEBIAN-CVE-2026-1858","EUVD-2026-26285","GHSA-9h5h-4q77-cphm","UBUNTU-CVE-2026-1858"],"status":"published","title":"wget2 Improper Certificate Validation","description":"wget2 accepts a server certificate with incorrect Key Usage (KU) or Extended Key Usage (EKU). If the attackers compromise a certificate (with the associated private key) issued for a different purpose, they may be able to reuse it for TLS server authentication.","severity":{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00155,"percentile":0.04697,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20"],"published":"2026-04-29T20:15:50Z","modified":"2026-10-27T09:47:30Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"wget2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.99.1-2.2","2.1.0-1","2.1.0-2","2.1.0-2.1","2.1.0-2.1~exp1","2.1.0-3","2.1.0-4","2.1.0-5","2.2.0+ds-1","2.2.0+ds-1~exp1","2.2.0+ds-1~exp2","2.2.0+ds-1~exp3","2.2.0+ds-2","2.2.0+ds-3"]},{"source":"osv","ecosystem":"Debian:13","package":"wget2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.0+ds-1","2.2.0+ds-1+deb13u1","2.2.0+ds-2","2.2.0+ds-3"]},{"source":"osv","ecosystem":"Debian:14","package":"wget2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.0+ds-1","2.2.0+ds-2","2.2.0+ds-3"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"wget2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0.20170806-1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"wget2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.99.1-2","1.99.1-2.1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"wget2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.99.1-2.2"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"wget2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.99.1-2.2","2.1.0-2","2.1.0-2.1build1","2.1.0-2.1build2"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"wget2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.0+ds-1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"wget2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.0+ds-3build1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"wget2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.0+ds-1","2.2.0+ds-2","2.2.0+ds-3","2.2.0+ds-3build1"]}],"products":[{"vendor":"gnu","product":"wget2"}],"references":[{"url":"https://www.tenable.com/security/research/tra-2026-37","tags":["Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-1858"},{"url":"https://github.com/advisories/GHSA-9h5h-4q77-cphm"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-1858","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-1858","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-1858","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-1858","title":"wget2 Improper Certificate Validation","description":"wget2 accepts a server certificate with incorrect Key Usage (KU) or Extended Key Usage (EKU). If the attackers compromise a certificate (with the associated private key) issued for a different purpose, they may be able to reuse it for TLS server authentication.","status":"published","published":"2026-04-29T20:15:50.866Z","modified":"2026-04-30T15:22:05.205Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:20:01.271368Z"}],"euvd":[{"id":"EUVD-2026-26285","description":"wget2 accepts a server certificate with incorrect Key Usage (KU) or Extended Key Usage (EKU). If the attackers compromise a certificate (with the associated private key) issued for a different purpose, they may be able to reuse it for TLS server authentication.","status":"published","published":"2026-04-29T20:15:50Z","modified":"2026-04-30T15:22:05Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T19:05:19.116327Z"}],"ghsa":[{"id":"GHSA-9h5h-4q77-cphm","title":"wget2 accepts a server certificate with incorrect Key Usage (KU) or Extended Key Usage (EKU). If...","description":"wget2 accepts a server certificate with incorrect Key Usage (KU) or Extended Key Usage (EKU). If the attackers compromise a certificate (with the associated private key) issued for a different purpose, they may be able to reuse it for TLS server authentication.","status":"published","published":"2026-04-29T21:31:31Z","modified":"2026-04-29T21:31:37Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T15:07:51.754992Z"}],"nvd":[{"id":"CVE-2026-1858","description":"wget2 accepts a server certificate with incorrect Key Usage (KU) or Extended Key Usage (EKU). If the attackers compromise a certificate (with the associated private key) issued for a different purpose, they may be able to reuse it for TLS server authentication.","status":"published","published":"2026-04-29T21:16:20.513Z","modified":"2026-10-26T20:10:00.16Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:12:16.626888Z"}],"osv":[{"id":"DEBIAN-CVE-2026-1858","description":"wget2 accepts a server certificate with incorrect Key Usage (KU) or Extended Key Usage (EKU). If the attackers compromise a certificate (with the associated private key) issued for a different purpose, they may be able to reuse it for TLS server authentication.","status":"published","published":"2026-04-29T21:16:20.513Z","modified":"2026-10-27T09:47:30.587164455Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:53.097669Z"},{"id":"UBUNTU-CVE-2026-1858","description":"wget2 accepts a server certificate with incorrect Key Usage (KU) or Extended Key Usage (EKU). If the attackers compromise a certificate (with the associated private key) issued for a different purpose, they may be able to reuse it for TLS server authentication.","status":"published","published":"2026-04-29T21:16:00Z","modified":"2026-10-17T12:56:47.221671096Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T16:56:01.334185Z"}]}}