======================================================================== CVE-2026-64193 CPAN Security Group ======================================================================== CVE ID: CVE-2026-64193 Distribution: Net-DNS Versions: through 1.55 MetaCPAN: https://metacpan.org/dist/Net-DNS VCS Repo: https://www.net-dns.org/svn/net-dns/ Net::DNS versions through 1.55 for Perl allow remote execution injection via EDNS EXTENDED ERROR Description ----------- 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->edns->option('EXTENDED-ERROR') is called in array context, for example with a payload of {0:`"<command>"`} in EXTRA-TEXT. Problem types ------------- - CWE-95 Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection') Solutions --------- Upgrade to version 1.56 or later. References ---------- https://www.net-dns.org/blog/#release-candidate-for-netdns-1.56 https://rt.cpan.org/Ticket/Display.html?id=179945 https://metacpan.org/release/NLNETLABS/Net-DNS-1.55_01/changes Timeline -------- - 2026-07-10: Issue reported publicly via RT. - 2026-07-10: Version 1.55_01 (release candidate for version 1.56) published on CPAN. - 2026-07-18: Version 1.56 published on CPAN. Credits ------- Steffen Ullrich, reporter
