{"id":"UBUNTU-CVE-2026-1858","details":"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.","modified":"2026-05-20T16:24:08.174796556Z","published":"2026-04-29T21:16:00Z","upstream":["CVE-2026-1858"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-1858"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-1858"}],"affected":[{"package":{"name":"wget2","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/wget2?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0.20170806-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libwget0","binary_version":"0.0.20170806-1"},{"binary_name":"wget2","binary_version":"0.0.20170806-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1858.json"}},{"package":{"name":"wget2","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/wget2?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.99.1-2","1.99.1-2.1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.99.1-2.1","binary_name":"libwget0"},{"binary_version":"1.99.1-2.1","binary_name":"wget2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1858.json"}},{"package":{"name":"wget2","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/wget2?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.99.1-2.2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.99.1-2.2","binary_name":"libwget0"},{"binary_name":"wget2","binary_version":"1.99.1-2.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1858.json"}},{"package":{"name":"wget2","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/wget2?arch=source&distro=noble"},"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"],"ecosystem_specific":{"binaries":[{"binary_name":"libwget2t64","binary_version":"2.1.0-2.1build2"},{"binary_version":"2.1.0-2.1build2","binary_name":"wget2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1858.json"}},{"package":{"name":"wget2","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/wget2?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.0+ds-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libwget3","binary_version":"2.2.0+ds-1"},{"binary_version":"2.2.0+ds-1","binary_name":"wget2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1858.json"}},{"package":{"name":"wget2","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/wget2?arch=source&distro=resolute"},"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"],"ecosystem_specific":{"binaries":[{"binary_version":"2.2.0+ds-3build1","binary_name":"libwget3"},{"binary_version":"2.2.0+ds-3build1","binary_name":"wget2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1858.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}