Amon2::Plugin::Web::CSRFDefender versions from 7.00 through 7.03 for Perl generate an insecure session id

{
  "id": "289da590844d9c60023976c583db5ca1f08abf1e80d00aa56127c9e98897503a",
  "url": "https://osv.dev/vulnerability/CVE-2026-5082",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Amon2::Plugin::Web::CSRFDefender versions from 7.00 through 7.03 for Perl generate an insecure session id",
    "summary": "Amon2::Plugin::Web::CSRFDefender versions from 7.00 through 7.03 for Perl generate an insecure session id. The generate_session_id function will attempt to read bytes from the /dev/urandom device, but if that is unavailable then it generates bytes using SHA-1 hash seeded with the built-in rand() function, the PID, and the high resolution epoch time. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage. Amon2::Plugin::Web::CSRFDefender versions before 7.00 were part of Amon2, which was vulnerable to insecure session ids due to CVE-2025-15604. Note that the author has deprecated this module.",
    "evidence": "osv:CVE-2026-5082",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-5082",
      "aliases": [
        "CVE-2026-5082"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/tokuhirom/amon2-plugin-web-csrfdefender",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f52bc5567d5f863a89be8bef18fcaa42ed33a803"
                },
                {
                  "last_affected": "de2fe66c42b3ec8f4e202a449e22fa24d6049bd4"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "7.00"
                      },
                      {
                        "last_affected": "7.03"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "7.03",
            "7.02",
            "7.01",
            "7.00"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-5082.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:21.059307842Z",
      "provider": "osv",
      "references": [
        "https://cpan.org/modules",
        "https://metacpan.org/release/TOKUHIROM/Amon2-Plugin-Web-CSRFDefender-7.03/source/lib/Amon2/Plugin/Web/CSRFDefender/Random.pm",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5082.json",
        "https://metacpan.org/release/TOKUHIROM/Amon2-Plugin-Web-CSRFDefender-7.04/changes",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-5082",
        "https://www.cve.org/CVERecord?id=CVE-2025-15604",
        "https://github.com/tokuhirom/Amon2-Plugin-Web-CSRFDefender"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-338",
          "CWE-340"
        ],
        "cna_assigner": "CPANSec",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5082.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-5082",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 487227,
  "published_at": "2026-04-08T05:48:43.633+00:00"
}