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.

The remote openSUSE 16 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21859-1 advisory.

    Changes in perl-Net-DNS:

    Updated to 1.570.0 (1.57):

    See /usr/share/doc/packages/perl-Net-DNS/Changes .

      -     Resync with IANA DNS parameters registry.
      -     EDNS: Add support for MQTYPE-QUERY option.
      -     Unbounded recursion when re-encoding message with misplaced TSIG CVE-2026-81928 bsc#1278084
      -     UNIX resolver can fail in taint mode

      -     Documentation issue for Net::DNS::RR::RRSIG::verify()
      -     Denial of Service via long DNS compression chains CVE-2026-64194 bsc#1272214
      -     Remote code injection via EDNS EXTENDED ERROR CVE-2026-64193 bsc#1272212
      -     UNIX.pm: Unreachable code warning using Apache/mod_perl

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-a0607111e6 advisory.

    Update to Net-DNS 1.56 (from 1.53).

    Security fixes:
    - CVE-worthy: Remote code injection via EDNS EXTENDED ERROR (rt.cpan #179945)
    - Denial of Service via long DNS compression chains (rt.cpan #179946)
    - Resolver/UNIX.pm no longer relies on shell for `uname` (rt.cpan #176900)

    Bug fixes:
    - Fix TCP read loop treating 1-byte recv() of 0 (0x30) as EOF,       which corrupted AXFRs (rt.cpan #177003)
    - Fix unhelpful TAINT error (rt.cpan #178183)
    - Fix unreachable-code warning under Apache/mod_perl (rt.cpan #179692/#176900)
    - Documentation fix for Net::DNS::RR::RRSIG::verify() (rt.cpan #180088).

    Other:
    - Resync with IANA DNS parameters and DNSSEC algorithm registries
    - New DNSKEY adt() accessor; DELEG parser backported to SVCB

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-1237afef8a advisory.

    Update to Net-DNS 1.56 (from 1.53).

    Security fixes:
    - CVE-worthy: Remote code injection via EDNS EXTENDED ERROR (rt.cpan #179945)
    - Denial of Service via long DNS compression chains (rt.cpan #179946)
    - Resolver/UNIX.pm no longer relies on shell for `uname` (rt.cpan #176900)

    Bug fixes:
    - Fix TCP read loop treating 1-byte recv() of 0 (0x30) as EOF,       which corrupted AXFRs (rt.cpan #177003)
    - Fix unhelpful TAINT error (rt.cpan #178183)
    - Fix unreachable-code warning under Apache/mod_perl (rt.cpan #179692/#176900)
    - Documentation fix for Net::DNS::RR::RRSIG::verify() (rt.cpan #180088).

    Other:
    - Resync with IANA DNS parameters and DNSSEC algorithm registries
    - New DNSKEY adt() accessor; DELEG parser backported to SVCB

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 13 host has a package installed that is affected by multiple vulnerabilities as referenced in the dsa-6459 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6459-1                   security@debian.org     https://www.debian.org/security/                     Salvatore Bonaccorso     August 22, 2026                       https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : libnet-dns-perl     CVE ID         : CVE-2026-64193 CVE-2026-64194     Debian Bug     : 1142503

    Two vulnerabilities were discovered in libnet-dns-perl, a Perl module to     perform DNS queries, which could result in denial of service or remote     code execution.

    For the stable distribution (trixie), these problems have been fixed in     version 1.56-0+deb13u1.

    We recommend that you upgrade your libnet-dns-perl packages.

    For the detailed security status of libnet-dns-perl please refer to its     security tracker page at:
    https://security-tracker.debian.org/tracker/libnet-dns-perl

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-2046 advisory.

    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. (CVE-2026-64193)

    Net::DNS versions through 1.55 for Perl allow Denial of Service via deep DNS compression pointer chains.

    Net::DNS::DomainName::decode follows RFC 1035 compression pointers by recursing into itself with no depth     limit. It is possible to construct a name which saturates the call stack (at least with larger TCP     responses), leading to a potential Denial of Service.

    The guard `$link < $offset` prevents forward and circular chains, but still allows arbitrarily long     backward chains. The per-offset cache (`$cache`) is populated at the start of each call and short-circuits     only re-traverses of the same offset - the initial descent through a fresh chain still recurses at full     depth.

    A crafted packet can chain two-byte compression pointers so that each one points two bytes earlier than     the previous, producing a chain length of `offset / 2`. For the 14-bit pointer field (max offset 16383)     this gives up to ~8191 recursive frames. For a TCP DNS message the limit is the 16-bit length field     (~32767 frames). Perl's default C stack handles only a few thousand frames; beyond that the process     receives SIGSEGV or similar, which is a denial-of-service for any application parsing untrusted DNS data.

    The vulnerability is triggered by `Net::DNS::Packet->new(\$wire)` i.e. any point where the library decodes     a DNS message from the network. (CVE-2026-64194)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21437-1 advisory.

    Changes in perl-Net-DNS:

    - CVE-2026-64194: Fixed a Denial of Service via deep DNS compression pointer chains [bsc#1272214]
    - CVE-2026-64193: Fixed a remote execution injection [bsc#1272212]

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-64193)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
347913	openSUSE 16 Security Update : perl-Net-DNS (openSUSE-SU-2026:21859-1)	Nessus	SuSE Local Security Checks	Local	critical
344485	Fedora 44 : perl-Net-DNS (2026-a0607111e6)	Nessus	Fedora Local Security Checks	Local	critical
344482	Fedora 43 : perl-Net-DNS (2026-1237afef8a)	Nessus	Fedora Local Security Checks	Local	critical
338856	Debian dsa-6459 : libnet-dns-perl - security update	Nessus	Debian Local Security Checks	Local	critical
337214	Amazon Linux 2023 : perl-Net-DNS, perl-Net-DNS-Nameserver, perl-Net-DNS-tests (ALAS2023-2026-2046)	Nessus	Amazon Linux Local Security Checks	Local	critical
329516	openSUSE 16 Security Update : perl-Net-DNS (openSUSE-SU-2026:21437-1)	Nessus	SuSE Local Security Checks	Local	critical
328337	Linux Distros Unpatched Vulnerability : CVE-2026-64193	Nessus	Misc.	Local	critical

Detections

Analytics

CVE-2026-64193

critical

Tenable Plugins

critical

critical

critical

critical

critical

critical

critical