CVE-2026-18536

{
  "id": "CVE-2026-18536",
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "published": "2026-08-01T11:16:38.483",
  "lastModified": "2026-10-23T23:10:00.157",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "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."
    },
    {
      "lang": "es",
      "value": "Las versiones de Data::Entropy anteriores a la 0.010 para Perl leen fuentes de entropía remotas a través de HTTP sin cifrar.\n\nSe accede a las fuentes remotas Data::Entropy::RawSource::RandomOrg y Data::Entropy::RawSource::RandomnumbersInfo a través de HTTP sin cifrar.\n\nLa verificación de integridad de Data::Entropy::RawSource::RandomOrg coincide trivialmente con cualquier cadena de bytes no vacía.\n\nCualquier atacante en la ruta, como una red WiFi abierta, un ISP comprometido, un portal cautivo o un proxy de salida hostil, sustituye la respuesta y de este modo elige los bytes devueltos por rand_bits y rand_int para cada aplicación que seleccionó una de estas fuentes a través de with_entropy_source. La respuesta del método _checkbuf está igualmente controlada por el atacante, por lo que el comportamiento de reintento/espera también es dirigible."
    }
  ],
  "affected": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "affectedData": [
        {
          "vendor": "RRWO",
          "product": "Data::Entropy",
          "defaultStatus": "unaffected",
          "collectionURL": "https://cpan.org/modules",
          "packageName": "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",
          "versions": [
            {
              "version": "0",
              "lessThan": "0.010",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-03T19:55:08.843137Z",
          "id": "CVE-2026-18536",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-319"
        },
        {
          "lang": "en",
          "value": "CWE-353"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:rrwo:data\\:\\:entropy:*:*:*:*:*:perl:*:*",
              "versionEndExcluding": "0.010",
              "matchCriteriaId": "8B313D17-8332-4B6B-9F48-3655144D7D19"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvv",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Vendor Advisory"
      ]
    },
    {
      "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": [
        "Release Notes"
      ]
    },
    {
      "url": "https://security.metacpan.org/docs/guides/random-data-for-security.html",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/08/01/8",
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ]
    }
  ]
}