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

No history.

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')

{"id": "CVE-2026-64193", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64193", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-07-21T18:54:48.456598Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "affected": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "affectedData": [{"repo": "https://www.net-dns.org/svn/net-dns/", "vendor": "NLNETLABS", "product": "Net::DNS", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThanOrEqual": "1.55"}], "packageName": "Net-DNS", "programFiles": ["lib/Net/DNS/RR/OPT.pm"], "collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "programRoutines": [{"name": "Net::DNS::RR::OPT::EXTENDED_ERROR::_decompose"}]}]}], "published": "2026-07-20T19:17:30.047", "references": [{"url": "https://metacpan.org/release/NLNETLABS/Net-DNS-1.55_01/changes", "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}, {"url": "https://rt.cpan.org/Ticket/Display.html?id=179945", "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}, {"url": "https://www.net-dns.org/blog/#release-candidate-for-netdns-1.56", "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}, {"url": "http://www.openwall.com/lists/oss-security/2026/07/20/12", "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "description": [{"lang": "en", "value": "CWE-95"}]}], "descriptions": [{"lang": "en", "value": "Net::DNS versions through 1.55 for Perl allow remote execution injection via EDNS EXTENDED ERROR.\n\nNet::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."}], "lastModified": "2026-07-21T19:35:17.130", "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}