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

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        "metrics": [
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              "attackVector": "NETWORK",
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    "datePublished": "2026-06-04T16:07:01.276Z",
    "dateReserved": "2026-06-02T16:06:23.068Z",
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          },
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          }
        ],
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        "lastModified": "2026-07-22T20:10:00.127",
        "metrics": {
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          ],
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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": [
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              "name": "Net::CIDR::Set::IPv4::_pack"
            },
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              "name": "Net::CIDR::Set::IPv4::_encode"
            },
            {
              "name": "Net::CIDR::Set::IPv6::_pack"
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              "name": "Net::CIDR::Set::IPv6::_pack_ipv4"
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    },
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      "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."
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  "references": [
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}

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

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{
  "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: 2026-09-17 17:08

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 (CVE-2026-49940)

Vulnerability from osv_ubuntu – Published: 2026-06-04 17:16 – Updated: 2026-06-11 13:06 – Source website

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

JSON

To clipboard

{
  "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 (CVE-2026-49940)

Tags

Sightings

Nomenclature

Related by attack behaviour