{
   "document": {
      "category": "csaf_security_advisory",
      "csaf_version": "2.0",
      "distribution": {
         "tlp": {
            "label": "WHITE",
            "url": "https://www.first.org/tlp/"
         }
      },
      "lang": "en",
      "notes": [
         {
            "category": "description",
            "text": "Plack::Middleware::Session::Simple versions through 0.04 for Perl generates session ids insecurely.  The default session id generator returns a SHA-1 hash seeded with the built-in rand function, the 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.  Predicable session ids could allow an attacker to gain access to systems.  Plack::Middleware::Session::Simple is intended to be compatible with Plack::Middleware::Session, which had a similar security issue CVE-2025-40923.",
            "title": "Vulnerability Description"
         }
      ],
      "publisher": {
         "category": "other",
         "contact_details": "gdt@cpan.org",
         "name": "giterlizzi",
         "namespace": "https://github.com/giterlizzi/"
      },
      "references": [
         {
            "category": "self",
            "summary": "CPANSA-Plack-Middleware-Session-Simple-2025-40926 JSON",
            "url": "https://raw.githubusercontent.com/giterlizzi/perl-CPANSA-CSAF/develop/csaf/white/2026/cpansa-plack-middleware-session-simple-2025-40926.json"
         },
         {
            "category": "external",
            "summary": "https://github.com/kazeburo/Plack-Middleware-Session-Simple/commit/760bb358b8f53e52cf415888a4ac858fd99bb24e.patch",
            "url": "https://github.com/kazeburo/Plack-Middleware-Session-Simple/commit/760bb358b8f53e52cf415888a4ac858fd99bb24e.patch"
         },
         {
            "category": "external",
            "summary": "https://github.com/kazeburo/Plack-Middleware-Session-Simple/pull/4",
            "url": "https://github.com/kazeburo/Plack-Middleware-Session-Simple/pull/4"
         },
         {
            "category": "external",
            "summary": "https://metacpan.org/release/KAZEBURO/Plack-Middleware-Session-Simple-0.04/source/lib/Plack/Middleware/Session/Simple.pm#L43",
            "url": "https://metacpan.org/release/KAZEBURO/Plack-Middleware-Session-Simple-0.04/source/lib/Plack/Middleware/Session/Simple.pm#L43"
         },
         {
            "category": "external",
            "summary": "https://security.metacpan.org/docs/guides/random-data-for-security.html",
            "url": "https://security.metacpan.org/docs/guides/random-data-for-security.html"
         },
         {
            "category": "external",
            "summary": "https://www.cve.org/CVERecord?id=CVE-2025-40923",
            "url": "https://www.cve.org/CVERecord?id=CVE-2025-40923"
         },
         {
            "category": "external",
            "summary": "CVE-2025-40926 (NVD)",
            "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40926"
         }
      ],
      "title": "Plack-Middleware-Session-Simple vulnerability",
      "tracking": {
         "current_release_date": "2026-03-05T00:00:00",
         "generator": {
            "engine": {
               "name": "CSAF Perl Toolkit",
               "version": "0.26"
            }
         },
         "id": "CPANSA-Plack-Middleware-Session-Simple-2025-40926",
         "initial_release_date": "2026-03-05T00:00:00",
         "revision_history": [
            {
               "date": "2026-03-05T00:00:00",
               "number": "1",
               "summary": "First release"
            }
         ],
         "status": "final",
         "version": "1"
      }
   },
   "product_tree": {
      "branches": [
         {
            "branches": [
               {
                  "category": "product_version_range",
                  "name": "vers:cpan/<0.05",
                  "product": {
                     "name": "Plack-Middleware-Session-Simple less than 0.05",
                     "product_id": "CSAFPID-0001",
                     "product_identification_helper": {
                        "purl": "pkg:cpan/Plack-Middleware-Session-Simple"
                     }
                  }
               },
               {
                  "category": "product_version_range",
                  "name": "vers:cpan/>=0.05",
                  "product": {
                     "name": "Plack-Middleware-Session-Simple greater than or equal 0.05",
                     "product_id": "CSAFPID-0002",
                     "product_identification_helper": {
                        "purl": "pkg:cpan/Plack-Middleware-Session-Simple"
                     }
                  }
               }
            ],
            "category": "product_name",
            "name": "Plack-Middleware-Session-Simple"
         }
      ]
   },
   "vulnerabilities": [
      {
         "cve": "CVE-2025-40926",
         "cwe": {
            "id": "CWE-338",
            "name": "Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)"
         },
         "notes": [
            {
               "category": "description",
               "text": "Plack::Middleware::Session::Simple versions before 0.05 for Perl generates session ids insecurely.\n\nThe default session id generator returns a SHA-1 hash seeded with the built-in rand function, the 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.\n\nPredictable session ids could allow an attacker to gain access to systems.\n\nPlack::Middleware::Session::Simple is intended to be compatible with Plack::Middleware::Session, which had a similar security issue CVE-2025-40923.",
               "title": "Vulnerability Description"
            }
         ],
         "product_status": {
            "fixed": [
               "CSAFPID-0002"
            ],
            "known_affected": [
               "CSAFPID-0001"
            ]
         },
         "scores": [
            {
               "cvss_v3": {
                  "baseScore": 9.8,
                  "baseSeverity": "CRITICAL",
                  "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "version": "3.1"
               },
               "products": [
                  "CSAFPID-0001"
               ]
            }
         ]
      }
   ]
}