Vulnerability-Lookup

CVE-2026-45191 (GCVE-0-2026-45191)

Vulnerability from cvelistv5 – Published: 2026-05-10 20:15 – Updated: 2026-05-11 16:37

Title

Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass

Summary

Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass. Mask forms like "/00" and "/01" pass validation and parse to the same prefix as their unpadded value. See also CVE-2026-45190.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-11 16:37 UTC

CWE

CWE-1289 - Improper Validation of Unsafe Equivalence in Input

Assigner

CPANSec redhat root

References

3 references

URL	Tags
https://github.com/stigtsp/Net-CIDR-Lite/commit/2…	patch
https://metacpan.org/release/STIGTSP/Net-CIDR-Lit…	release-notes
https://www.cve.org/CVERecord?id=CVE-2026-45190	related

Impacted products

1 product

Vendor	Product	Version	CPE status
STIGTSP	Net::CIDR::Lite	Affected: 0 , < 0.24 (custom)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "LOW",
              "baseScore": 6.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "LOW",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-45191",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-11T16:37:44.711895Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-11T16:37:48.124Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "Net-CIDR-Lite",
          "product": "Net::CIDR::Lite",
          "programFiles": [
            "Lite.pm"
          ],
          "programRoutines": [
            {
              "name": "Net::CIDR::Lite::add"
            }
          ],
          "repo": "https://github.com/stigtsp/Net-CIDR-Lite",
          "vendor": "STIGTSP",
          "versions": [
            {
              "lessThan": "0.24",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass.\n\nMask forms like \"/00\" and \"/01\" pass validation and parse to the same prefix as their unpadded value.\n\nSee also CVE-2026-45190."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1289",
              "description": "CWE-1289 Improper Validation of Unsafe Equivalence in Input",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-10T20:15:53.897Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/stigtsp/Net-CIDR-Lite/commit/24e2c439ec405e5256024b9acefd4f7008c5ed0c.patch"
        },
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://metacpan.org/release/STIGTSP/Net-CIDR-Lite-0.24/changes"
        },
        {
          "tags": [
            "related"
          ],
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-45190"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to version 0.24 or newer, or apply the patch provided."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "timeline": [
        {
          "lang": "en",
          "time": "2026-05-10T00:00:00.000Z",
          "value": "Vulnerability found"
        },
        {
          "lang": "en",
          "time": "2026-05-10T00:00:00.000Z",
          "value": "Net-CIDR-Lite version 0.24 released"
        }
      ],
      "title": "Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass",
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-45191",
    "datePublished": "2026-05-10T20:15:53.897Z",
    "dateReserved": "2026-05-10T16:36:05.708Z",
    "dateUpdated": "2026-05-11T16:37:48.124Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-45191",
      "date": "2026-09-15",
      "epss": "0.003",
      "percentile": "0.22565"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:39:31+00:00",
      "cve": "CVE-2026-45191",
      "id": "CVE-2026-45191",
      "initial_release_date": "2026-05-10T20:15:53.897000+00:00",
      "product_status:known_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "perl-Net-CIDR-Lite: Net::CIDR::Lite: IP ACL bypass due to improper CIDR mask validation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45191.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-06-26T02:17:04Z",
      "cve": "CVE-2026-45191",
      "id": "CVE-2026-45191",
      "initial_release_date": "2026-05-11T14:13:00Z",
      "product_status:known_affected": "6",
      "product_status:recommended": "17",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-45191",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-45191.json",
      "version": "6"
    },
    "vulnrichment": {
      "containers": "{\"cna\": {\"title\": \"Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"affected\": [{\"repo\": \"https://github.com/stigtsp/Net-CIDR-Lite\", \"vendor\": \"STIGTSP\", \"product\": \"Net::CIDR::Lite\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"0.24\", \"versionType\": \"custom\"}], \"packageName\": \"Net-CIDR-Lite\", \"programFiles\": [\"Lite.pm\"], \"collectionURL\": \"https://cpan.org/modules\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"Net::CIDR::Lite::add\"}]}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2026-05-10T00:00:00.000Z\", \"value\": \"Vulnerability found\"}, {\"lang\": \"en\", \"time\": \"2026-05-10T00:00:00.000Z\", \"value\": \"Net-CIDR-Lite version 0.24 released\"}], \"solutions\": [{\"lang\": \"en\", \"value\": \"Upgrade to version 0.24 or newer, or apply the patch provided.\"}], \"references\": [{\"url\": \"https://github.com/stigtsp/Net-CIDR-Lite/commit/24e2c439ec405e5256024b9acefd4f7008c5ed0c.patch\", \"tags\": [\"patch\"]}, {\"url\": \"https://metacpan.org/release/STIGTSP/Net-CIDR-Lite-0.24/changes\", \"tags\": [\"release-notes\"]}, {\"url\": \"https://www.cve.org/CVERecord?id=CVE-2026-45190\", \"tags\": [\"related\"]}], \"x_generator\": {\"engine\": \"cpansec-cna-tool 0.1\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass.\\n\\nMask forms like \\\"/00\\\" and \\\"/01\\\" pass validation and parse to the same prefix as their unpadded value.\\n\\nSee also CVE-2026-45190.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-1289\", \"description\": \"CWE-1289 Improper Validation of Unsafe Equivalence in Input\"}]}], \"providerMetadata\": {\"orgId\": \"9b29abf9-4ab0-4765-b253-1875cd9b441e\", \"shortName\": \"CPANSec\", \"dateUpdated\": \"2026-05-10T20:15:53.897Z\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 6.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"LOW\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-45191\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-05-11T16:37:44.711895Z\"}}}], \"providerMetadata\": {\"shortName\": \"CISA-ADP\", \"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"dateUpdated\": \"2026-05-11T16:37:33.165Z\"}}]}",
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      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-45191

Vulnerability from fkie_nvd - Published: 2026-05-10 21:16 - Updated: 2026-07-24 13:10

Severity

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

Summary

References

	URL	Tags
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://github.com/stigtsp/Net-CIDR-Lite/commit/24e2c439ec405e5256024b9acefd4f7008c5ed0c.patch
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/STIGTSP/Net-CIDR-Lite-0.24/changes
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://www.cve.org/CVERecord?id=CVE-2026-45190

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "Net-CIDR-Lite",
          "product": "Net::CIDR::Lite",
          "programFiles": [
            "Lite.pm"
          ],
          "programRoutines": [
            {
              "name": "Net::CIDR::Lite::add"
            }
          ],
          "repo": "https://github.com/stigtsp/Net-CIDR-Lite",
          "vendor": "STIGTSP",
          "versions": [
            {
              "lessThan": "0.24",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass.\n\nMask forms like \"/00\" and \"/01\" pass validation and parse to the same prefix as their unpadded value.\n\nSee also CVE-2026-45190."
    },
    {
      "lang": "es",
      "value": "Las versiones de Net::CIDR::Lite anteriores a 0.24 para Perl no consideran adecuadamente los caracteres cero superfluos en los valores de m\u00e1scara CIDR, lo que puede permitir la omisi\u00f3n de ACL de IP.\n\nFormas de m\u00e1scara como \u0027/00\u0027 y \u0027/01\u0027 pasan la validaci\u00f3n y se analizan al mismo prefijo que su valor sin relleno.\n\nV\u00e9ase tambi\u00e9n CVE-2026-45190."
    }
  ],
  "id": "CVE-2026-45191",
  "lastModified": "2026-07-24T13:10:00.223",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
          "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-2026-45191",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-11T16:37:44.711895Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-10T21:16:29.380",
  "references": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://github.com/stigtsp/Net-CIDR-Lite/commit/24e2c439ec405e5256024b9acefd4f7008c5ed0c.patch"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://metacpan.org/release/STIGTSP/Net-CIDR-Lite-0.24/changes"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-45190"
    }
  ],
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1289"
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary"
    }
  ]
}

GHSA-FW62-67J2-4WMC

Vulnerability from github – Published: 2026-05-10 21:30 – Updated: 2026-05-11 18:31

Details

Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass.

Mask forms like "/00" and "/01" pass validation and parse to the same prefix as their unpadded value.

OPENSUSE-SU-2026:10780-1

Vulnerability from csaf_opensuse - Published: 2026-05-14 00:00 - Updated: 2026-05-14 00:00

Summary

perl-Net-CIDR-Lite-0.240.0-1.1 on GA media

Severity

Moderate

Scope

4 vulnerabilities in this advisory, including CVE-2026-45191.

CVE-2026-45191

7.5 (High)


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

Recommended: 4 products

Open the full advisory

SUSE-SU-2026:2113-1

Vulnerability from csaf_suse - Published: 2026-05-29 15:24 - Updated: 2026-05-29 15:24

Summary

Security update for perl-Net-CIDR-Lite

Severity

Important

Scope

4 vulnerabilities in this advisory, including CVE-2026-45191.

CVE-2026-45191

7.5 (High)


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

Recommended: 11 products

Open the full advisory

ubuntu-cve-2026-45191

Vulnerability from osv_ubuntu

Published

2026-06-15 00:00

Modified

2026-06-24 09:02

Summary

Details

Severity

6.5 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-45191	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-45191	REPORT
	https://github.com/stigtsp/Net-CIDR-Lite/commit/2…	REPORT
	https://www.openwall.com/lists/oss-security/2026/…	REPORT
	https://lists.security.metacpan.org/cve-announce/…	REPORT
	https://ubuntu.com/security/notices/USN-8453-1	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libnet-cidr-lite-perl",
            "binary_version": "0.21-1ubuntu0.16.04.1~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "libnet-cidr-lite-perl",
        "purl": "pkg:deb/ubuntu/libnet-cidr-lite-perl@0.21-1ubuntu0.16.04.1~esm2?arch=source\u0026distro=esm-apps-legacy/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.21-1ubuntu0.16.04.1~esm2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.21-1",
        "0.21-1ubuntu0.16.04.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libnet-cidr-lite-perl",
            "binary_version": "0.21-1ubuntu0.18.04.1~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "libnet-cidr-lite-perl",
        "purl": "pkg:deb/ubuntu/libnet-cidr-lite-perl@0.21-1ubuntu0.18.04.1~esm2?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.21-1ubuntu0.18.04.1~esm2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.21-1",
        "0.21-1ubuntu0.18.04.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libnet-cidr-lite-perl",
            "binary_version": "0.21-2ubuntu0.1+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "libnet-cidr-lite-perl",
        "purl": "pkg:deb/ubuntu/libnet-cidr-lite-perl@0.21-2ubuntu0.1+esm2?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.21-2ubuntu0.1+esm2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.21-2",
        "0.21-2ubuntu0.1",
        "0.21-2ubuntu0.1+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libnet-cidr-lite-perl",
            "binary_version": "0.22-1ubuntu0.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "libnet-cidr-lite-perl",
        "purl": "pkg:deb/ubuntu/libnet-cidr-lite-perl@0.22-1ubuntu0.2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.22-1ubuntu0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.22-1",
        "0.22-1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libnet-cidr-lite-perl",
            "binary_version": "0.22-2ubuntu0.24.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "libnet-cidr-lite-perl",
        "purl": "pkg:deb/ubuntu/libnet-cidr-lite-perl@0.22-2ubuntu0.24.04.2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.22-2ubuntu0.24.04.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.22-2",
        "0.22-2ubuntu0.24.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libnet-cidr-lite-perl",
            "binary_version": "0.22-2ubuntu0.25.10.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "libnet-cidr-lite-perl",
        "purl": "pkg:deb/ubuntu/libnet-cidr-lite-perl@0.22-2ubuntu0.25.10.2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.22-2ubuntu0.25.10.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.22-2",
        "0.22-2ubuntu0.25.10.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libnet-cidr-lite-perl",
            "binary_version": "0.22-2ubuntu0.26.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "libnet-cidr-lite-perl",
        "purl": "pkg:deb/ubuntu/libnet-cidr-lite-perl@0.22-2ubuntu0.26.04.2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.22-2ubuntu0.26.04.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.22-2",
        "0.22-2ubuntu0.26.04.1"
      ]
    }
  ],
  "aliases": [],
  "details": "Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass. Mask forms like \"/00\" and \"/01\" pass validation and parse to the same prefix as their unpadded value. See also CVE-2026-45190.",
  "id": "UBUNTU-CVE-2026-45191",
  "modified": "2026-06-24T09:02:14Z",
  "published": "2026-06-15T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-45191"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-45191"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/stigtsp/Net-CIDR-Lite/commit/24e2c439ec405e5256024b9acefd4f7008c5ed0c"
    },
    {
      "type": "REPORT",
      "url": "https://www.openwall.com/lists/oss-security/2026/05/10/7"
    },
    {
      "type": "REPORT",
      "url": "https://lists.security.metacpan.org/cve-announce/msg/39920370/"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8453-1"
    }
  ],
  "related": [
    "USN-8453-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-45191"
  ]
}

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-2026-45191 (GCVE-0-2026-45191)

FKIE_CVE-2026-45191

GHSA-FW62-67J2-4WMC

OPENSUSE-SU-2026:10780-1

SUSE-SU-2026:2113-1

ubuntu-cve-2026-45191

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour