NLNETLABS Perl up to 1.55 EXTENDED_ERROR _decompose EXTRA-TEXT injection

Summaryinfo

A vulnerability labeled as critical has been found in NLNETLABS Perl up to 1.55. Impacted is the function Net::DNS::RR::OPT::EXTENDED_ERROR::_decompose of the component EXTENDED_ERROR. Such manipulation of the argument EXTRA-TEXT leads to injection. This vulnerability is documented as CVE-2026-64193. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in NLNETLABS Perl up to 1.55. It has been rated as critical. Affected by this issue is the function Net::DNS::RR::OPT::EXTENDED_ERROR::_decompose of the component EXTENDED_ERROR. The manipulation of the argument EXTRA-TEXT with an unknown input leads to a injection vulnerability. Using CWE to declare the problem leads to CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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 advisory is available at net-dns.org. This vulnerability is handled as CVE-2026-64193 since 07/19/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1055 by the MITRE ATT&CK project.

Upgrading to version 1.56 eliminates this vulnerability.

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Productinfo

Type

• Programming Language Software

Vendor

• NLNETLABS

Name

• Perl

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26
• 1.27
• 1.28
• 1.29
• 1.30
• 1.31
• 1.32
• 1.33
• 1.34
• 1.35
• 1.36
• 1.37
• 1.38
• 1.39
• 1.40
• 1.41
• 1.42
• 1.43
• 1.44
• 1.45
• 1.46
• 1.47
• 1.48
• 1.49
• 1.50
• 1.51
• 1.52
• 1.53
• 1.54
• 1.55

License

• open-source

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CPE 2.2info

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