Mojolicious::Plugin::CaptchaPNG version 1.05 for Perl uses a weak random number source for generating the captcha text

{
  "id": "21ae34dca20c1fe0912696110fdc73308e8f1840e7fd9b64f481ac5a8efdca81",
  "url": "https://osv.dev/vulnerability/CVE-2025-40916",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Mojolicious::Plugin::CaptchaPNG version 1.05 for Perl uses a weak random number source for generating the captcha text",
    "summary": "Mojolicious::Plugin::CaptchaPNG version 1.05 for Perl uses a weak random number source for generating the captcha. That version uses the built-in rand() function for generating the captcha text as well as image noise, which is insecure.",
    "evidence": "osv:CVE-2025-40916",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2025-40916",
      "aliases": [
        "CVE-2025-40916"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/gryphonshafer/mojo-plugin-captchapng",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f4069779330217c7a59c752be95d79bff472d56d"
                },
                {
                  "last_affected": "f4069779330217c7a59c752be95d79bff472d56d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "1.05"
                      },
                      {
                        "last_affected": "1.05"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.05",
            "v1.05"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40916.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.260447929Z",
      "provider": "osv",
      "references": [
        "https://cpan.org/modules",
        "https://metacpan.org/pod/perlfunc#rand",
        "https://metacpan.org/release/GRYPHON/Mojolicious-Plugin-CaptchaPNG-1.04/diff/GRYPHON/Mojolicious-Plugin-CaptchaPNG-1.05/lib/Mojolicious/Plugin/CaptchaPNG.pm",
        "https://metacpan.org/release/GRYPHON/Mojolicious-Plugin-CaptchaPNG-1.06/changes",
        "https://security.metacpan.org/docs/guides/random-data-for-security.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40916.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-40916",
        "https://github.com/gryphonshafer/Mojo-Plugin-CaptchaPNG"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-338",
          "CWE-804"
        ],
        "cna_assigner": "CPANSec",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40916.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-40916",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493802,
  "published_at": "2025-06-16T11:01:08.871+00:00"
}