Vulnerability-Lookup

GHSA-HWPR-JC4F-7WW3

Vulnerability from github – Published: 2026-07-20 21:31 – Updated: 2026-07-20 21:31

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64193"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-95"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-20T19:17:30Z",
    "severity": null
  },
  "details": "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\u0027s eval. There is some escaping done for $ and @, but not for backticks. This can be exploited for command execution if $pkt-\u003eedns-\u003eoption(\u0027EXTENDED-ERROR\u0027) is called in array context, for example with a payload of {0:`\"\u003ccommand\u003e\"`} in EXTRA-TEXT.",
  "id": "GHSA-hwpr-jc4f-7ww3",
  "modified": "2026-07-20T21:31:49Z",
  "published": "2026-07-20T21:31:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64193"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/NLNETLABS/Net-DNS-1.55_01/changes"
    },
    {
      "type": "WEB",
      "url": "https://rt.cpan.org/Ticket/Display.html?id=179945"
    },
    {
      "type": "WEB",
      "url": "https://www.net-dns.org/blog/#release-candidate-for-netdns-1.56"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/07/20/12"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

Vulnerability from cvelistv5 – Published: 2026-07-20 17:54 – Updated: 2026-07-21 18:55

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

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

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

Assigner

CPANSec

References

4 references

URL	Tags
https://www.net-dns.org/blog/#release-candidate-f…
https://rt.cpan.org/Ticket/Display.html?id=179945	issue-tracking
https://metacpan.org/release/NLNETLABS/Net-DNS-1.…	release-notes
http://www.openwall.com/lists/oss-security/2026/0…

Impacted products

1 product

Vendor	Product	Version
NLNETLABS	Net::DNS	Affected: 0 , ≤ 1.55 (custom)

Credits

Steffen Ullrich

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JSON

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-07-20T20:30:04.101Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/07/20/12"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 9.8,
              "baseSeverity": "CRITICAL",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-64193",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-21T18:54:48.456598Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-21T18:55:09.291Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "Net-DNS",
          "product": "Net::DNS",
          "programFiles": [
            "lib/Net/DNS/RR/OPT.pm"
          ],
          "programRoutines": [
            {
              "name": "Net::DNS::RR::OPT::EXTENDED_ERROR::_decompose"
            }
          ],
          "repo": "https://www.net-dns.org/svn/net-dns/",
          "vendor": "NLNETLABS",
          "versions": [
            {
              "lessThanOrEqual": "1.55",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
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      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Steffen Ullrich"
        }
      ],
      "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\u0027s eval. There is some escaping done for $ and @, but not for backticks. This can be exploited for command execution if $pkt-\u003eedns-\u003eoption(\u0027EXTENDED-ERROR\u0027) is called in array context, for example with a payload of {0:`\"\u003ccommand\u003e\"`} in EXTRA-TEXT."
        }
      ],
      "problemTypes": [
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          "descriptions": [
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              "cweId": "CWE-95",
              "description": "CWE-95 Improper Neutralization of Directives in Dynamically Evaluated Code (\u0027Eval Injection\u0027)",
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              "type": "CWE"
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-20T17:54:42.087Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "url": "https://www.net-dns.org/blog/#release-candidate-for-netdns-1.56"
        },
        {
          "tags": [
            "issue-tracking"
          ],
          "url": "https://rt.cpan.org/Ticket/Display.html?id=179945"
        },
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://metacpan.org/release/NLNETLABS/Net-DNS-1.55_01/changes"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to version 1.56 or later."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "timeline": [
        {
          "lang": "en",
          "time": "2026-07-10T00:00:00.000Z",
          "value": "Issue reported publicly via RT."
        },
        {
          "lang": "en",
          "time": "2026-07-10T00:00:00.000Z",
          "value": "Version 1.55_01 (release candidate for version 1.56) published on CPAN."
        },
        {
          "lang": "en",
          "time": "2026-07-18T00:00:00.000Z",
          "value": "Version 1.56 published on CPAN."
        }
      ],
      "title": "Net::DNS versions through 1.55 for Perl allow remote execution injection via EDNS EXTENDED ERROR",
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
    }
  },
  "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": "2026-07-21T18:55:09.291Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-HWPR-JC4F-7WW3

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

Tags

Sightings

Nomenclature