{
   "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 before version 0.35 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.",
            "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-2025-40923 JSON",
            "url": "https://raw.githubusercontent.com/giterlizzi/perl-CPANSA-CSAF/develop/csaf/white/2025/cpansa-plack-middleware-session-2025-40923.json"
         },
         {
            "category": "external",
            "summary": "https://github.com/plack/Plack-Middleware-Session/commit/1fbfbb355e34e7f4b3906f66cf958cedadd2b9be.patch",
            "url": "https://github.com/plack/Plack-Middleware-Session/commit/1fbfbb355e34e7f4b3906f66cf958cedadd2b9be.patch"
         },
         {
            "category": "external",
            "summary": "https://github.com/plack/Plack-Middleware-Session/pull/52",
            "url": "https://github.com/plack/Plack-Middleware-Session/pull/52"
         },
         {
            "category": "external",
            "summary": "https://metacpan.org/release/MIYAGAWA/Plack-Middleware-Session-0.34/source/lib/Plack/Session/State.pm#L22",
            "url": "https://metacpan.org/release/MIYAGAWA/Plack-Middleware-Session-0.34/source/lib/Plack/Session/State.pm#L22"
         },
         {
            "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": "CVE-2025-40923 (NVD)",
            "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40923"
         }
      ],
      "title": "Plack-Middleware-Session vulnerability",
      "tracking": {
         "current_release_date": "2025-07-16T00:00:00",
         "generator": {
            "engine": {
               "name": "CSAF Perl Toolkit",
               "version": "0.26"
            }
         },
         "id": "CPANSA-Plack-Middleware-Session-2025-40923",
         "initial_release_date": "2025-07-16T00:00:00",
         "revision_history": [
            {
               "date": "2025-07-16T00:00:00",
               "number": "1",
               "summary": "First release"
            }
         ],
         "status": "final",
         "version": "1"
      }
   },
   "product_tree": {
      "branches": [
         {
            "branches": [
               {
                  "category": "product_version_range",
                  "name": "vers:cpan/<0.35",
                  "product": {
                     "name": "Plack-Middleware-Session less than 0.35",
                     "product_id": "CSAFPID-0001"
                  }
               },
               {
                  "category": "product_version_range",
                  "name": "vers:cpan/>=0.35",
                  "product": {
                     "name": "Plack-Middleware-Session greater than or equal 0.35",
                     "product_id": "CSAFPID-0002"
                  }
               }
            ],
            "category": "product_name",
            "name": "Plack-Middleware-Session"
         }
      ]
   },
   "vulnerabilities": [
      {
         "cve": "CVE-2025-40923",
         "cwe": {
            "id": "CWE-338",
            "name": "Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)"
         },
         "notes": [
            {
               "category": "description",
               "text": "Plack-Middleware-Session before version 0.35 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\nPredicable session ids could allow an attacker to gain access to systems.",
               "title": "Vulnerability Description"
            }
         ],
         "product_status": {
            "fixed": [
               "CSAFPID-0002"
            ],
            "known_affected": [
               "CSAFPID-0001"
            ]
         },
         "scores": [
            {
               "cvss_v3": {
                  "baseScore": 7.3,
                  "baseSeverity": "HIGH",
                  "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "version": "3.1"
               },
               "products": [
                  "CSAFPID-0001"
               ]
            }
         ]
      }
   ]
}