CVE-2026-64193

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.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
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

Configurations

No configuration.

History

21 Jul 2026, 19:17

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 9.8

20 Jul 2026, 21:16

Type	Values Removed	Values Added
References		() http://www.openwall.com/lists/oss-security/2026/07/20/12 -

20 Jul 2026, 19:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-20 19:17

Updated : 2026-07-21 19:35

NVD link : CVE-2026-64193

Mitre link : CVE-2026-64193

CVE.ORG link : CVE-2026-64193

JSON object : View

Products Affected

No product.

CWE

CWE-95

Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')

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