What’s Vulnerable › Vulnerabilities

CVE-2026-64193: Net::DNS versions through 1.55 for Perl allow remote execution injection via EDNS EXTENDED ERROR

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-20 · updated 2026-10-24
• Weakness: CWE-95

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.

Affected products

• NLNETLABS Net::DNS: through 1.55

References

• https://metacpan.org/release/NLNETLABS/Net-DNS-1.55_01/changes
• https://rt.cpan.org/Ticket/Display.html?id=179945
• https://www.net-dns.org/blog/#release-candidate-for-netdns-1.56
• http://www.openwall.com/lists/oss-security/2026/07/20/12

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