Vulnerability-Lookup

CVE-2026-49940 (GCVE-0-2026-49940)

Vulnerability from cvelistv5 – Published: 2026-06-04 16:07 – Updated: 2026-06-04 17:36

Title

Net::CIDR::Set versions through 0.20 for Perl accept non-ASCII IP addresses and netmasks

Summary

Net::CIDR::Set versions through 0.20 for Perl accept non-ASCII IP addresses and netmasks. Unicode digits such as the Arabic-Indic One (U+0661) were accepted but not properly parsed as numbers. This could allow network masks to accept larger networks.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-04 17:33 UTC

CWE

CWE-1289 - Improper Validation of Unsafe Equivalence in Input

Assigner

CPANSec redhat root

References

2 references

URL	Tags
https://metacpan.org/release/RRWO/Net-CIDR-Set-0.…	release-notes
https://nvd.nist.gov/vuln/detail/CVE-2025-40911	related

Impacted products

1 product

Vendor	Product	Version	CPE status
RRWO	Net::CIDR::Set	Affected: 0 , ≤ 0.20 (custom)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 6.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "LOW",
              "integrityImpact": "LOW",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
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                  }
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                "timestamp": "2026-06-04T17:33:44.242109Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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          "defaultStatus": "unaffected",
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              "name": "Net::CIDR::Set::IPv4::_encode"
            },
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              "name": "Net::CIDR::Set::IPv6::_pack"
            },
            {
              "name": "Net::CIDR::Set::IPv6::_pack_ipv4"
            }
          ],
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          "vendor": "RRWO",
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          "lang": "en",
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        }
      ],
      "problemTypes": [
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          "descriptions": [
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        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
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          ],
          "url": "https://metacpan.org/release/RRWO/Net-CIDR-Set-0.21/changes"
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          ],
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40911"
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    "assignerShortName": "CPANSec",
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    "datePublished": "2026-06-04T16:07:01.276Z",
    "dateReserved": "2026-06-02T16:06:23.068Z",
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      "initial_release_date": "2026-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "Net::CIDR::Set versions through 0.20 for Perl accept non-ASCII IP addresses and netmasks",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-49940.json",
      "version": "3"
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      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-49940.json",
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}

FKIE_CVE-2026-49940

Vulnerability from fkie_nvd - Published: 2026-06-04 17:16 - Updated: 2026-07-22 20:10

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Summary

References

	URL	Tags
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/RRWO/Net-CIDR-Set-0.21/changes	Release Notes
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://nvd.nist.gov/vuln/detail/CVE-2025-40911	Third Party Advisory, US Government Resource

Impacted products

	Vendor	Product	Version
	rrwo	net\	\

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "Net-CIDR-Set",
          "product": "Net::CIDR::Set",
          "programRoutines": [
            {
              "name": "Net::CIDR::Set::IPv4::_pack"
            },
            {
              "name": "Net::CIDR::Set::IPv4::_encode"
            },
            {
              "name": "Net::CIDR::Set::IPv6::_pack"
            },
            {
              "name": "Net::CIDR::Set::IPv6::_pack_ipv4"
            }
          ],
          "repo": "https://github.com/robrwo/perl-Net-CIDR-Set",
          "vendor": "RRWO",
          "versions": [
            {
              "lessThanOrEqual": "0.20",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:rrwo:net\\:\\:cidr\\:\\:set:*:*:*:*:*:perl:*:*",
              "matchCriteriaId": "24C7BD24-8729-408F-BD1D-F8F0608DFE50",
              "versionEndExcluding": "0.21",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Net::CIDR::Set versions through 0.20 for Perl accept non-ASCII IP addresses and netmasks.\n\nUnicode digits such as the Arabic-Indic One (U+0661) were accepted but not properly parsed as numbers.  This could allow network masks to accept larger networks."
    },
    {
      "lang": "es",
      "value": "Las versiones de Net::CIDR::Set hasta la 0.20 para Perl aceptan direcciones IP y m\u00e1scaras de red no ASCII.\n\nD\u00edgitos Unicode como el Uno ar\u00e1bigo-\u00edndico (U+0661) eran aceptados pero no se analizaban correctamente como n\u00fameros. Esto podr\u00eda permitir que las m\u00e1scaras de red aceptaran redes m\u00e1s grandes."
    }
  ],
  "id": "CVE-2026-49940",
  "lastModified": "2026-07-22T20:10:00.127",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.5,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-49940",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-04T17:33:44.242109Z",
          "version": "2.0.3"
        }
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  "published": "2026-06-04T17:16:33.053",
  "references": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Release Notes"
      ],
      "url": "https://metacpan.org/release/RRWO/Net-CIDR-Set-0.21/changes"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Third Party Advisory",
        "US Government Resource"
      ],
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40911"
    }
  ],
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1289"
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary"
    }
  ]
}

GHSA-HPV8-77XM-27WX

Vulnerability from github – Published: 2026-06-04 18:30 – Updated: 2026-06-04 18:30

Details

Net::CIDR::Set versions through 0.20 for Perl accept non-ASCII IP addresses and netmasks.

Unicode digits such as the Arabic-Indic One (U+0661) were accepted but not properly parsed as numbers. This could allow network masks to accept larger networks.

Severity

6.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-49940"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1289"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-04T17:16:33Z",
    "severity": "MODERATE"
  },
  "details": "Net::CIDR::Set versions through 0.20 for Perl accept non-ASCII IP addresses and netmasks.\n\nUnicode digits such as the Arabic-Indic One (U+0661) were accepted but not properly parsed as numbers.  This could allow network masks to accept larger networks.",
  "id": "GHSA-hpv8-77xm-27wx",
  "modified": "2026-06-04T18:30:32Z",
  "published": "2026-06-04T18:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40911"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-49940"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/RRWO/Net-CIDR-Set-0.21/changes"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

OPENSUSE-SU-2026:10951-1

Vulnerability from csaf_opensuse - Published: 2026-06-03 00:00 - Updated: 2026-09-16 21:15

Summary

perl-Net-CIDR-Set-0.210.0-1.1 on GA media

Severity

Moderate

Scope

2 vulnerabilities in this advisory, including CVE-2026-49940.

CVE-2026-49940

Recommended: 4 products

Open the full advisory

ubuntu-cve-2026-49940

Vulnerability from osv_ubuntu

Published

2026-06-04 17:16

Modified

2026-06-11 13:06

Summary

Details

Severity

6.5 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-49940	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-49940	REPORT
	https://github.com/robrwo/perl-Net-CIDR-Set/commi…	REPORT

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{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libnet-cidr-set-perl",
            "binary_version": "0.13-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "libnet-cidr-set-perl",
        "purl": "pkg:deb/ubuntu/libnet-cidr-set-perl@0.13-2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.13-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libnet-cidr-set-perl",
            "binary_version": "0.13-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "libnet-cidr-set-perl",
        "purl": "pkg:deb/ubuntu/libnet-cidr-set-perl@0.13-3?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.13-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libnet-cidr-set-perl",
            "binary_version": "0.13-5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "libnet-cidr-set-perl",
        "purl": "pkg:deb/ubuntu/libnet-cidr-set-perl@0.13-5?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.13-4",
        "0.13-5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libnet-cidr-set-perl",
            "binary_version": "0.19-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "libnet-cidr-set-perl",
        "purl": "pkg:deb/ubuntu/libnet-cidr-set-perl@0.19-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.13-5",
        "0.15-1",
        "0.19-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libnet-cidr-set-perl",
            "binary_version": "0.19-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "libnet-cidr-set-perl",
        "purl": "pkg:deb/ubuntu/libnet-cidr-set-perl@0.19-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.19-1"
      ]
    }
  ],
  "aliases": [],
  "details": "Net::CIDR::Set versions through 0.20 for Perl accept non-ASCII IP addresses and netmasks. Unicode digits such as the Arabic-Indic One (U+0661) were accepted but not properly parsed as numbers.  This could allow network masks to accept larger networks.",
  "id": "UBUNTU-CVE-2026-49940",
  "modified": "2026-06-11T13:06:30Z",
  "published": "2026-06-04T17:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-49940"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-49940"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/robrwo/perl-Net-CIDR-Set/commit/875010b4217afe9a61cee519f0e0250847ecf699"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-49940"
  ]
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-49940 (GCVE-0-2026-49940)

FKIE_CVE-2026-49940

GHSA-HPV8-77XM-27WX

OPENSUSE-SU-2026:10951-1

ubuntu-cve-2026-49940

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour