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Fencer Vulns
critical 9.8

CVE-2026-64193 json

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

published 2026-07-20 3 mo ago modified 2026-10-24 15 d ago also EUVD-2026-46051

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 73%
public exploits
0
none known

Summary

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.

Patch / fix

  • libnet-dns-perl Debian 13 1.56-0+deb13u1
  • libnet-dns-perl Debian 14 1.56-1

debian advisories DEBIAN-CVE-2026-64193

  • perl-Net-DNS openSUSE Leap 16.0 1.570.0-bp160.1.1
  • perl-Net-DNS openSUSE Tumbleweed 1.560.0-1.1
  • perl-Net-DNS openSUSE Leap 16.0 1.460.0-bp160.2.1

opensuse advisories openSUSE-SU-2026:21859-1openSUSE-SU-2026:11396-1openSUSE-SU-2026:21437-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-64193 updated cvss 9.8

Net::DNS: Net::DNS: Arbitrary code execution via EDNS EXTENDED ERROR handling

  • Red Hat Enterprise Linux 6 perl-Net-DNS, perl-Net-DNS-Nameserver Red Hat Enterprise Linux 7 perl-Net-DNS, perl-Net-DNS-Nameserver Red Hat Enterprise Linux 8 perl-Net-DNS Red Hat Enterprise Linux 9 perl-Net-DNS, perl-Net-DNS-Nameserver
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
3 mo ago

Exploit prediction

1.44% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • NLNETLABS Net::DNS

Classification

Weakness
  • CWE-95 Improper Neutralization of Directives in Dynamically Evaluated Code

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.