{"id":"UBUNTU-CVE-2026-64193","details":"Net::DNS versions through 1.55 for Perl allow remote execution injection via EDNS EXTENDED ERROR. Net::DNS::RR::OPT::EXTENDED_ERROR::_decompose parses the EXTRA-TEXT field of an EDNS EXTENDED-ERROR option (RFC 8914) by tokenising the raw bytes and passing the result to Perl's eval. There is some escaping done for $ and @, but not for backticks. This can be exploited for command execution if $pkt-\u003eedns-\u003eoption('EXTENDED-ERROR') is called in array context, for example with a payload of {0:`\"\u003ccommand\u003e\"`} in EXTRA-TEXT.","modified":"2026-07-29T10:18:23.083201679Z","published":"2026-07-20T19:17:00Z","upstream":["CVE-2026-64193"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-64193"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-64193"},{"type":"REPORT","url":"https://lists.security.metacpan.org/cve-announce/msg/41989543/"},{"type":"REPORT","url":"https://rt.cpan.org/Ticket/Display.html?id=179945"}],"affected":[{"package":{"name":"libnet-dns-perl","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/libnet-dns-perl?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.68-1.2","0.68-1.2build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libnet-dns-perl","binary_version":"0.68-1.2build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64193.json"}},{"package":{"name":"libnet-dns-perl","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/libnet-dns-perl?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.81-2","0.81-2build1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.81-2build1","binary_name":"libnet-dns-perl"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64193.json"}},{"package":{"name":"libnet-dns-perl","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/libnet-dns-perl?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10-2"],"ecosystem_specific":{"binaries":[{"binary_name":"libnet-dns-perl","binary_version":"1.10-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64193.json"}},{"package":{"name":"libnet-dns-perl","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libnet-dns-perl?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.20-1","1.21-1","1.22-1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.22-1","binary_name":"libnet-dns-perl"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64193.json"}},{"package":{"name":"libnet-dns-perl","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libnet-dns-perl?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.29-1","1.32-1","1.33-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libnet-dns-perl","binary_version":"1.33-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64193.json"}},{"package":{"name":"libnet-dns-perl","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libnet-dns-perl?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.39-2ubuntu1","1.40-1ubuntu1","1.44-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"libnet-dns-perl","binary_version":"1.44-1ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64193.json"}},{"package":{"name":"libnet-dns-perl","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libnet-dns-perl?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.50-1ubuntu1","1.53-1ubuntu1","1.54-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.54-1ubuntu1","binary_name":"libnet-dns-perl"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64193.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}