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

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Summary

CVECVE-2026-64193
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-20 19:17:30 UTC
Updated2026-07-20 21:16:50 UTC
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:`"<command>"`} in EXTRA-TEXT.

Risk And Classification

Problem Types: CWE-95 | CWE-95 CWE-95 Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA NLNETLABS NetDNS affected 1.55 custom Not specified

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2026/07/20/12 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
www.net-dns.org/blog 9b29abf9-4ab0-4765-b253-1875cd9b441e www.net-dns.org
metacpan.org/release/NLNETLABS/Net-DNS-1.55_01/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
rt.cpan.org/Ticket/Display.html 9b29abf9-4ab0-4765-b253-1875cd9b441e rt.cpan.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Steffen Ullrich (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-07-10T00:00:00.000ZIssue reported publicly via RT.
CNA2026-07-10T00:00:00.000ZVersion 1.55_01 (release candidate for version 1.56) published on CPAN.
CNA2026-07-18T00:00:00.000ZVersion 1.56 published on CPAN.

Solutions

CNA: Upgrade to version 1.56 or later.

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