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

{
  "id": "26bad736bd65f98d094f77e4e9d83cfe4695131bcd1e6402c524d0c3dfbd8a65",
  "url": "https://osv.dev/vulnerability/CVE-2026-18536",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "osv:CVE-2026-18536",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-18536",
      "aliases": [
        "CVE-2026-18536",
        "GHSA-845w-rcqw-jwvv"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/robrwo/data-entropy",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "a07c1b739206e29cb0b56ccc0583be3cdabbe202"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.010"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "cpe": "cpe:2.3:a:rrwo:data\\:\\:entropy:*:*:*:*:*:perl:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.010"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.009",
            "v0.008",
            "v0.007"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-18536.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.880135731Z",
      "provider": "osv",
      "references": [
        "https://cpan.org/modules",
        "https://metacpan.org/release/RRWO/Data-Entropy-0.008/view/lib/Data/Entropy.pm#STATUS",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18536.json",
        "https://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvv",
        "https://metacpan.org/release/RRWO/Data-Entropy-0.010/changes",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-18536",
        "https://github.com/robrwo/Data-Entropy",
        "https://security.metacpan.org/docs/guides/random-data-for-security.html"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-319",
          "CWE-353"
        ],
        "cna_assigner": "CPANSec",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18536.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-18536",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492571,
  "published_at": "2026-08-01T10:35:38.392+00:00"
}