HTTP::Session versions before 0.54 for Perl defaults to using insecurely generated session ids

{
  "id": "3b0bca459da92e99b3ce84bb147794b7ca298983b3d7b8a2aedb6e205c944ed7",
  "url": "https://osv.dev/vulnerability/CVE-2026-3256",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "HTTP::Session versions before 0.54 for Perl defaults to using insecurely generated session ids",
    "summary": "HTTP::Session versions before 0.54 for Perl defaults to using insecurely generated session ids. HTTP::Session defaults to using HTTP::Session::ID::SHA1 to generate session ids using a SHA-1 hash seeded with the built-in rand function, the high resolution epoch time, and the PID. 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. The distribution includes HTTP::session::ID::MD5 which contains a similar flaw, but uses the MD5 hash instead.",
    "evidence": "osv:CVE-2026-3256",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-3256",
      "aliases": [
        "CVE-2026-3256"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/tokuhirom/http-session",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "20948a2499bc1b06617a7669a9d155f8e9bfbcd7"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.54"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.53",
            "0.52",
            "0.51",
            "0.50",
            "0.49",
            "0.48",
            "0.46",
            "0.45",
            "0.44",
            "0.43",
            "0.42",
            "0.41",
            "0.40",
            "0.39",
            "0.38",
            "0.37",
            "0.36",
            "0.35",
            "0.34",
            "0.33",
            "0.32",
            "0.31"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-3256.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.501900631Z",
      "provider": "osv",
      "references": [
        "https://cpan.org/modules",
        "https://metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/MD5.pm",
        "https://metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/SHA1.pm",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3256.json",
        "https://metacpan.org/release/TOKUHIROM/http-session-0.54/changes",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-3256",
        "https://github.com/tokuhirom/http-session",
        "https://security.metacpan.org/docs/guides/random-data-for-security.html"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-338",
          "CWE-340"
        ],
        "cna_assigner": "CPANSec",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3256.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-3256",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 520294,
  "published_at": "2026-03-28T18:52:39.917+00:00"
}