https://bugzilla.redhat.com/show_bug.cgi?id=2509247
Bug ID: 2509247
Summary: CVE-2026-64193 perl-Net-DNS: Net::DNS: Arbitrary code
execution via EDNS EXTENDED ERROR handling
[fedora-all]
Product: Fedora
Version: rawhide
Status: NEW
Whiteboard: {"flaws": ["bc9a89c5-ade0-417b-8267-8c5b26db5153"]}
Component: perl-Net-DNS
Keywords: Security, SecurityTracking
Severity: urgent
Priority: urgent
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Blocks: 2502954 (CVE-2026-64193)
Target Milestone: ---
Classification: Fedora
Disclaimer: Community trackers are created by Red Hat Product Security team on
a best effort basis. Package maintainers are required to ascertain if the flaw
indeed affects their package, before starting the update process.
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.
Referenced Bugs:
https://bugzilla.redhat.com/show_bug.cgi?id=2502954
[Bug 2502954] CVE-2026-64193 Net::DNS: Net::DNS: Arbitrary code execution via
EDNS EXTENDED ERROR handling
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