Vulnerability-Lookup

ubuntu-cve-2026-18536

Vulnerability from osv_ubuntu

Published

2026-08-04 00:00

Modified

2026-08-04 00:00

Summary

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.

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": "2026-08-04T00:00:00Z",
  "published": "2026-08-04T00:00:00Z",
  "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"
  ]
}

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

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 (v2.0.3)

CWE

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

Assigner

CPANSec

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
RRWO	Data::Entropy	Affected: 0 , < 0.010 (custom)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-08-01T15:23:24.896Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/08/01/8"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-18536",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-03T19:55:08.843137Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-03T19:55:35.372Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "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"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "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."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-319",
              "description": "CWE-319 Cleartext Transmission of Sensitive Information",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-353",
              "description": "CWE-353 Missing Support for Integrity Check",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-01T10:35:38.392Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvv"
        },
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://metacpan.org/release/RRWO/Data-Entropy-0.010/changes"
        },
        {
          "url": "https://metacpan.org/release/RRWO/Data-Entropy-0.008/view/lib/Data/Entropy.pm#STATUS"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://security.metacpan.org/docs/guides/random-data-for-security.html"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP",
      "workarounds": [
        {
          "lang": "en",
          "value": "Deployments should not use the RandomOrg or RandomnumbersInfo sources, as these are flawed.\n\nThey have been removed from Data::Entropy 0.010. (There was a change to use HTTPS to connect to these sources in version 0.009 that did not work.)\n\nNote that Data::Entropy has been deprecated since version 0.008. Users are advised to migrate to alternative solutions that use system sources of random data, such as Crypt::SysRandom, Crypt::URandom or Crypt::PRNG."
        }
      ],
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-18536",
    "datePublished": "2026-08-01T10:35:38.392Z",
    "dateReserved": "2026-07-31T20:31:42.315Z",
    "dateUpdated": "2026-08-03T19:55:35.372Z",
    "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.

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.

Action not permitted

ubuntu-cve-2026-18536

Vulnerability from osv_ubuntu

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

Tags

Sightings

Nomenclature