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    4 vulnerabilities found for Net::DNS by NLNETLABS

    CVE-2026-64194 (GCVE-0-2026-64194)

    Vulnerability from nvd – Published: 2026-07-20 17:55 – Updated: 2026-07-20 20:30
    VLAI
    Title
    Net::DNS versions through 1.55 for Perl allow Denial of Service via deep DNS compression pointer chains
    Summary
    Net::DNS versions through 1.55 for Perl allow Denial of Service via deep DNS compression pointer chains. Net::DNS::DomainName::decode follows RFC 1035 compression pointers by recursing into itself with no depth limit. It is possible to construct a name which saturates the call stack (at least with larger TCP responses), leading to a potential Denial of Service. The guard `$link < $offset` prevents forward and circular chains, but still allows arbitrarily long backward chains. The per-offset cache (`$cache`) is populated at the start of each call and short-circuits only re-traverses of the same offset - the initial descent through a fresh chain still recurses at full depth. A crafted packet can chain two-byte compression pointers so that each one points two bytes earlier than the previous, producing a chain length of `offset / 2`. For the 14-bit pointer field (max offset 16383) this gives up to ~8191 recursive frames. For a TCP DNS message the limit is the 16-bit length field (~32767 frames). Perl's default C stack handles only a few thousand frames; beyond that the process receives SIGSEGV or similar, which is a denial-of-service for any application parsing untrusted DNS data. The vulnerability is triggered by `Net::DNS::Packet->new(\$wire)` i.e. any point where the library decodes a DNS message from the network.
    Severity
    No CVSS data available.
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    NLNETLABS Net::DNS Affected: 0 , ≤ 1.55 (custom)
    		Create a notification for this product.
    Credits
    Steffen Ullrich
    Show details on NVD website
    To clipboard 

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          {
            "url": "http://www.openwall.com/lists/oss-security/2026/07/20/13"
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        ],
        "title": "CVE Program Container"
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            {
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          ],
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          "vendor": "NLNETLABS",
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          "url": "https://www.net-dns.org/blog/#release-candidate-for-netdns-1.56"
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    CVE-2026-64193 (GCVE-0-2026-64193)

    Vulnerability from nvd – Published: 2026-07-20 17:54 – Updated: 2026-07-20 20:30
    VLAI
    Title
    Net::DNS versions through 1.55 for Perl allow remote execution injection via EDNS EXTENDED ERROR
    Summary
    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.
    Severity
    No CVSS data available.
    CWE
    • CWE-95 - Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')
    Assigner
    References
    Impacted products
    Vendor Product Version
    NLNETLABS Net::DNS Affected: 0 , ≤ 1.55 (custom)
    		Create a notification for this product.
    Credits
    Steffen Ullrich
    Show details on NVD website
    To clipboard 

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    CVE-2026-64194 (GCVE-0-2026-64194)

    Vulnerability from cvelistv5 – Published: 2026-07-20 17:55 – Updated: 2026-07-20 20:30
    VLAI
    Title
    Net::DNS versions through 1.55 for Perl allow Denial of Service via deep DNS compression pointer chains
    Summary
    Net::DNS versions through 1.55 for Perl allow Denial of Service via deep DNS compression pointer chains. Net::DNS::DomainName::decode follows RFC 1035 compression pointers by recursing into itself with no depth limit. It is possible to construct a name which saturates the call stack (at least with larger TCP responses), leading to a potential Denial of Service. The guard `$link < $offset` prevents forward and circular chains, but still allows arbitrarily long backward chains. The per-offset cache (`$cache`) is populated at the start of each call and short-circuits only re-traverses of the same offset - the initial descent through a fresh chain still recurses at full depth. A crafted packet can chain two-byte compression pointers so that each one points two bytes earlier than the previous, producing a chain length of `offset / 2`. For the 14-bit pointer field (max offset 16383) this gives up to ~8191 recursive frames. For a TCP DNS message the limit is the 16-bit length field (~32767 frames). Perl's default C stack handles only a few thousand frames; beyond that the process receives SIGSEGV or similar, which is a denial-of-service for any application parsing untrusted DNS data. The vulnerability is triggered by `Net::DNS::Packet->new(\$wire)` i.e. any point where the library decodes a DNS message from the network.
    Severity
    No CVSS data available.
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    NLNETLABS Net::DNS Affected: 0 , ≤ 1.55 (custom)
    		Create a notification for this product.
    Credits
    Steffen Ullrich
    Show details on NVD website
    To clipboard 

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    CVE-2026-64193 (GCVE-0-2026-64193)

    Vulnerability from cvelistv5 – Published: 2026-07-20 17:54 – Updated: 2026-07-20 20:30
    VLAI
    Title
    Net::DNS versions through 1.55 for Perl allow remote execution injection via EDNS EXTENDED ERROR
    Summary
    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.
    Severity
    No CVSS data available.
    CWE
    • CWE-95 - Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')
    Assigner
    References
    Impacted products
    Vendor Product Version
    NLNETLABS Net::DNS Affected: 0 , ≤ 1.55 (custom)
    		Create a notification for this product.
    Credits
    Steffen Ullrich
    Show details on NVD website
    To clipboard 

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  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-64193",
    "datePublished": "2026-07-20T17:54:42.087Z",
    "dateReserved": "2026-07-19T10:13:00.756Z",
    "dateUpdated": "2026-07-20T20:30:04.101Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}