CPANSA-Net-DNS-2026-64193: Net-DNS vulnerability
| Publisher | giterlizzi | Document category | csaf_security_advisory |
|---|---|---|---|
| Initial release date | 2026-07-20T00:00:00 | Engine | CSAF Perl Toolkit 0.26 |
| Current release date | 2026-07-20T00:00:00 | Build Date | |
| Current version | 1 | Status | final |
| CVSS v3.1 Base Score | 9.8 | Severity | Critical |
| Original language | Language | en | |
| Also referred to | |||
Vulnerability 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:`"
Vulnerabilities
CVE-2026-64193
Vulnerability DescriptionNet::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:`"
| Weakness | CWE-95 : Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection') |
|---|
Product status
Known affected
| Product | Score | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Net-DNS less than 1.56 |
|
Fixed
- Net-DNS greater than or equal 1.56
giterlizzi
Namespace: https://github.com/giterlizzi/
gdt@cpan.org
References
- CPANSA-Net-DNS-2026-64193 JSON self
https://raw.githubusercontent.com/giterlizzi/perl-CPANSA-CSAF/develop/csaf/white/2026/cpansa-net-dns-2026-64193.json - https://metacpan.org/release/NLNETLABS/Net-DNS-1.55_01/changes external
https://metacpan.org/release/NLNETLABS/Net-DNS-1.55_01/changes - https://rt.cpan.org/Ticket/Display.html?id=179945 external
https://rt.cpan.org/Ticket/Display.html?id=179945 - https://www.net-dns.org/blog/#release-candidate-for-netdns-1.56 external
https://www.net-dns.org/blog/#release-candidate-for-netdns-1.56 - http://www.openwall.com/lists/oss-security/2026/07/20/12 external
http://www.openwall.com/lists/oss-security/2026/07/20/12 - CVE-2026-64193 (NVD) external
https://nvd.nist.gov/vuln/detail/CVE-2026-64193
Revision history
| Version | Date of the revision | Summary of the revision |
|---|---|---|
| 1 | Mon Jul 20 00:00:00 2026 | First release |
Sharing rules
TLP:WHITE
For the TLP version see: https://www.first.org/tlp/