Vulnerability-Lookup

CVE-2026-18536 (GCVE-0-2026-18536)

Vulnerability from cvelistv5 – Published: 2026-08-01 10:35 – Updated: 2026-08-03 19:55

Title

Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP

Summary

Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP. The Data::Entropy::RawSource::RandomOrg and Data::Entropy::RawSource::RandomnumbersInfo remote sources are accessed over plain HTTP. The Data::Entropy::RawSource::RandomOrg integrity check trivially matches any non-empty byte string. Any on-path attacker, such as open WiFi, a compromised ISP, captive portal, or a hostile egress proxy substitutes the response and thereby chooses the bytes returned by rand_bits and rand_int for every application that selected one of these sources via with_entropy_source. The _checkbuf method response is equally attacker-controlled, so the retry/sleep behaviour is steerable too.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-03 19:55 UTC

CWE

CWE-319 - Cleartext Transmission of Sensitive Information
CWE-353 - Missing Support for Integrity Check

Assigner

CPANSec redhat root

References

5 references

URL	Tags
https://github.com/robrwo/Data-Entropy/security/a…	vendor-advisory
https://metacpan.org/release/RRWO/Data-Entropy-0.…	release-notes
https://metacpan.org/release/RRWO/Data-Entropy-0.…
https://security.metacpan.org/docs/guides/random-…	technical-description
http://www.openwall.com/lists/oss-security/2026/08/01/8

Impacted products

1 product

Vendor	Product	Version	CPE status
RRWO	Data::Entropy	Affected: 0 , < 0.010 (custom)	guessed

Show details on NVD website

JSON

To clipboard

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      "product_status:known_not_affected": "1",
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}

FKIE_CVE-2026-18536

Vulnerability from fkie_nvd - Published: 2026-08-01 11:16 - Updated: 2026-08-07 18:52

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Summary

References

URL	Tags
9b29abf9-4ab0-4765-b253-1875cd9b441e	https://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvv	Vendor Advisory
9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/RRWO/Data-Entropy-0.008/view/lib/Data/Entropy.pm#STATUS	Release Notes
9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/RRWO/Data-Entropy-0.010/changes	Release Notes
9b29abf9-4ab0-4765-b253-1875cd9b441e	https://security.metacpan.org/docs/guides/random-data-for-security.html	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/08/01/8	Mailing List, Third Party Advisory

Impacted products

	Vendor	Product	Version
	rrwo	data\	\

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "Data-Entropy",
          "product": "Data::Entropy",
          "programFiles": [
            "lib/Data/Entropy/RawSource/RandomOrg.pm",
            "lib/Data/Entropy/RawSource/RandomnumbersInfo.pm"
          ],
          "programRoutines": [
            {
              "name": "Data::Entropy::RawSource::RandomOrg::_checkbuf"
            },
            {
              "name": "Data::Entropy::RawSource::RandomOrg::_ensure_buffer"
            },
            {
              "name": "Data::Entropy::RawSource::RandomnumbersInfo::_ensure_buffer"
            }
          ],
          "repo": "https://github.com/robrwo/Data-Entropy",
          "vendor": "RRWO",
          "versions": [
            {
              "lessThan": "0.010",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
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              "matchCriteriaId": "8B313D17-8332-4B6B-9F48-3655144D7D19",
              "versionEndExcluding": "0.010",
              "vulnerable": true
            }
          ],
          "negate": false,
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    {
      "lang": "en",
      "value": "Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP.\n\nThe Data::Entropy::RawSource::RandomOrg and Data::Entropy::RawSource::RandomnumbersInfo remote sources are accessed over plain HTTP.\n\nThe Data::Entropy::RawSource::RandomOrg integrity check trivially matches any non-empty byte string.\n\nAny on-path attacker, such as open WiFi, a compromised ISP, captive portal, or a hostile egress proxy substitutes the response and thereby chooses the bytes returned by rand_bits and rand_int for every application that selected one of these sources via with_entropy_source. The _checkbuf method response is equally attacker-controlled, so the retry/sleep behaviour is steerable too."
    }
  ],
  "id": "CVE-2026-18536",
  "lastModified": "2026-08-07T18:52:30.823",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-18536",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-03T19:55:08.843137Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-01T11:16:38.483",
  "references": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvv"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Release Notes"
      ],
      "url": "https://metacpan.org/release/RRWO/Data-Entropy-0.008/view/lib/Data/Entropy.pm#STATUS"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Release Notes"
      ],
      "url": "https://metacpan.org/release/RRWO/Data-Entropy-0.010/changes"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.metacpan.org/docs/guides/random-data-for-security.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2026/08/01/8"
    }
  ],
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-319"
        },
        {
          "lang": "en",
          "value": "CWE-353"
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary"
    }
  ]
}

UBUNTU-CVE-2026-18536 (CVE-2026-18536)

Vulnerability from osv_ubuntu – Published: 2026-08-01 11:16 – Updated: 2026-08-06 00:12 – Source website

Details

Severity

7.5 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-18536	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-18536	REPORT
	https://lists.security.metacpan.org/cve-announce/…	REPORT
	https://github.com/robrwo/Data-Entropy/security/a…	REPORT
	https://metacpan.org/release/RRWO/Data-Entropy-0.…	REPORT
	https://metacpan.org/release/RRWO/Data-Entropy-0.…	REPORT
	https://security.metacpan.org/docs/guides/random-…	REPORT
	http://www.openwall.com/lists/oss-security/2026/08/01/8	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libdata-entropy-perl",
            "binary_version": "0.007-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "libdata-entropy-perl",
        "purl": "pkg:deb/ubuntu/libdata-entropy-perl@0.007-3?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.007-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libdata-entropy-perl",
            "binary_version": "0.007-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "libdata-entropy-perl",
        "purl": "pkg:deb/ubuntu/libdata-entropy-perl@0.007-3?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.007-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libdata-entropy-perl",
            "binary_version": "0.007-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "libdata-entropy-perl",
        "purl": "pkg:deb/ubuntu/libdata-entropy-perl@0.007-3?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.007-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libdata-entropy-perl",
            "binary_version": "0.007-3.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "libdata-entropy-perl",
        "purl": "pkg:deb/ubuntu/libdata-entropy-perl@0.007-3.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.007-3.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libdata-entropy-perl",
            "binary_version": "0.007-4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "libdata-entropy-perl",
        "purl": "pkg:deb/ubuntu/libdata-entropy-perl@0.007-4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.007-4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libdata-entropy-perl",
            "binary_version": "0.008-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "libdata-entropy-perl",
        "purl": "pkg:deb/ubuntu/libdata-entropy-perl@0.008-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.008-1"
      ]
    }
  ],
  "aliases": [],
  "details": "Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP. The Data::Entropy::RawSource::RandomOrg and Data::Entropy::RawSource::RandomnumbersInfo remote sources are accessed over plain HTTP. The Data::Entropy::RawSource::RandomOrg integrity check trivially matches any non-empty byte string. Any on-path attacker, such as open WiFi, a compromised ISP, captive portal, or a hostile egress proxy substitutes the response and thereby chooses the bytes returned by rand_bits and rand_int for every application that selected one of these sources via with_entropy_source. The _checkbuf method response is equally attacker-controlled, so the retry/sleep behaviour is steerable too.",
  "id": "UBUNTU-CVE-2026-18536",
  "modified": "2026-08-06T00:12:19Z",
  "published": "2026-08-01T11:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-18536"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-18536"
    },
    {
      "type": "REPORT",
      "url": "https://lists.security.metacpan.org/cve-announce/msg/42317754/"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvv"
    },
    {
      "type": "REPORT",
      "url": "https://metacpan.org/release/RRWO/Data-Entropy-0.008/view/lib/Data/Entropy.pm#STATUS"
    },
    {
      "type": "REPORT",
      "url": "https://metacpan.org/release/RRWO/Data-Entropy-0.010/changes"
    },
    {
      "type": "REPORT",
      "url": "https://security.metacpan.org/docs/guides/random-data-for-security.html"
    },
    {
      "type": "REPORT",
      "url": "http://www.openwall.com/lists/oss-security/2026/08/01/8"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-18536"
  ]
}

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.

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-2026-18536 (GCVE-0-2026-18536)

FKIE_CVE-2026-18536

UBUNTU-CVE-2026-18536 (CVE-2026-18536)

Tags

Sightings

Nomenclature

Related by attack behaviour