{"schemaVersion":3,"id":"CVE-2026-64193","aliases":["UBUNTU-CVE-2026-64193","DEBIAN-CVE-2026-64193"],"status":"published","duplicateOf":null,"title":null,"description":"Net::DNS versions through 1.55 for Perl allow remote execution injection via EDNS EXTENDED ERROR.\n\nNet::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->edns->option('EXTENDED-ERROR') is called in array context, for example with a payload of {0:`\"<command>\"`} in EXTRA-TEXT.","dates":{"published":"2026-07-20T17:54:42.087Z","modified":"2026-07-21T18:55:09.291Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.8,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":10,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · 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1.56-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"libnet-dns-perl","name":"libnet-dns-perl","label":"libnet-dns-perl","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/libnet-dns-perl","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"nlnetlabs","product":"net::dns","name":"Net::DNS","label":"net::dns","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 1.55","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 1.55","eol":null,"hubHref":null}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.net-dns.org/blog/#release-candidate-for-netdns-1.56","label":"www.net-dns.org/blog/","hostname":"www.net-dns.org","tags":[]},{"url":"https://rt.cpan.org/Ticket/Display.html?id=179945","label":"rt.cpan.org/Ticket/Display.html?id=179945","hostname":"rt.cpan.org","tags":["Issue Tracking","REPORT"]},{"url":"https://metacpan.org/release/NLNETLABS/Net-DNS-1.55_01/changes","label":"metacpan.org/release/NLNETLABS/Net-DNS-1.55_01/changes","hostname":"metacpan.org","tags":["Release Notes"]},{"url":"http://www.openwall.com/lists/oss-security/2026/07/20/12","label":"www.openwall.com/lists/oss-security/2026/07/20/12","hostname":"www.openwall.com","tags":[]},{"url":"https://ubuntu.com/security/CVE-2026-64193","label":"ubuntu.com/security/CVE-2026-64193","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64193","label":"www.cve.org/CVERecord?id=CVE-2026-64193","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://lists.security.metacpan.org/cve-announce/msg/41989543/","label":"lists.security.metacpan.org/cve-announce/msg/41989543/","hostname":"lists.security.metacpan.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-64193","label":"security-tracker.debian.org/tracker/CVE-2026-64193","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["MGASA-2026-0448","OPENSUSE-SU-2026:11396-1","OPENSUSE-SU-2026:21437-1","OPENSUSE-SU-2026:21859-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:11396-1","OPENSUSE-SU-2026:21437-1","OPENSUSE-SU-2026:21859-1"]},"timeline":[{"kind":"published","date":"2026-07-20T17:54:42.087Z","label":"Published","detail":"Vulnerability 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