PT-2026-61695 · Nlnetlabs · Net::Dns

Steffen Ullrich · CVE-2026-64193 · Published 2026-07-20 · Updated 2026-07-20

NVD

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Fix

Eval Injection

Weakness Enumeration

CWE-95

Related Identifiers

CVE-2026-64193

Affected Products

Net::Dns

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-64193 · Security Note
• http://openwall.com/lists/oss-security/2026/07/20/12 · Note
• https://net-dns.org/blog/#release-candidate-for-netdns-1.56 · Note
• https://metacpan.org/release/NLNETLABS/Net-DNS-1.55_01/changes · Note
• https://rt.cpan.org/Ticket/Display.html?id=179945 · Note