{
   "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": "HTTP::Session2 versions before 1.12 for Perl for Perl may generate weak session ids using the rand() function.  The HTTP::Session2 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.  HTTP::Session2 after version 1.02 will attempt to use the /dev/urandom device to generate a session id, but if the device is unavailable (for example, under Windows), then it will revert to the insecure method described above.",
            "title": "Vulnerability Description"
         }
      ],
      "publisher": {
         "category": "other",
         "contact_details": "gdt@cpan.org",
         "name": "giterlizzi",
         "namespace": "https://github.com/giterlizzi/"
      },
      "references": [
         {
            "category": "self",
            "summary": "CPANSA-HTTP-Session2-2026-3255 JSON",
            "url": "https://raw.githubusercontent.com/giterlizzi/perl-CPANSA-CSAF/develop/csaf/white/2026/cpansa-http-session2-2026-3255.json"
         },
         {
            "category": "external",
            "summary": "https://github.com/tokuhirom/HTTP-Session2/commit/9cfde4d7e0965172aef5dcfa3b03bb48df93e636.patch",
            "url": "https://github.com/tokuhirom/HTTP-Session2/commit/9cfde4d7e0965172aef5dcfa3b03bb48df93e636.patch"
         },
         {
            "category": "external",
            "summary": "https://metacpan.org/release/TOKUHIROM/HTTP-Session2-1.01/source/lib/HTTP/Session2/ServerStore.pm#L68",
            "url": "https://metacpan.org/release/TOKUHIROM/HTTP-Session2-1.01/source/lib/HTTP/Session2/ServerStore.pm#L68"
         },
         {
            "category": "external",
            "summary": "https://metacpan.org/release/TOKUHIROM/HTTP-Session2-1.11/source/lib/HTTP/Session2/Random.pm#L35",
            "url": "https://metacpan.org/release/TOKUHIROM/HTTP-Session2-1.11/source/lib/HTTP/Session2/Random.pm#L35"
         },
         {
            "category": "external",
            "summary": "https://metacpan.org/release/TOKUHIROM/HTTP-Session2-1.12/changes",
            "url": "https://metacpan.org/release/TOKUHIROM/HTTP-Session2-1.12/changes"
         },
         {
            "category": "external",
            "summary": "http://www.openwall.com/lists/oss-security/2026/02/27/12",
            "url": "http://www.openwall.com/lists/oss-security/2026/02/27/12"
         },
         {
            "category": "external",
            "summary": "CVE-2026-3255 (NVD)",
            "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3255"
         }
      ],
      "title": "HTTP-Session2 vulnerability",
      "tracking": {
         "current_release_date": "2026-02-27T00:00:00",
         "generator": {
            "engine": {
               "name": "CSAF Perl Toolkit",
               "version": "0.26"
            }
         },
         "id": "CPANSA-HTTP-Session2-2026-3255",
         "initial_release_date": "2026-02-27T00:00:00",
         "revision_history": [
            {
               "date": "2026-02-27T00:00:00",
               "number": "1",
               "summary": "First release"
            }
         ],
         "status": "final",
         "version": "1"
      }
   },
   "product_tree": {
      "branches": [
         {
            "branches": [
               {
                  "category": "product_version_range",
                  "name": "vers:cpan/<1.12",
                  "product": {
                     "name": "HTTP-Session2 less than 1.12",
                     "product_id": "CSAFPID-0001",
                     "product_identification_helper": {
                        "purl": "pkg:cpan/HTTP-Session2"
                     }
                  }
               },
               {
                  "category": "product_version_range",
                  "name": "vers:cpan/>=1.12",
                  "product": {
                     "name": "HTTP-Session2 greater than or equal 1.12",
                     "product_id": "CSAFPID-0002",
                     "product_identification_helper": {
                        "purl": "pkg:cpan/HTTP-Session2"
                     }
                  }
               }
            ],
            "category": "product_name",
            "name": "HTTP-Session2"
         }
      ]
   },
   "vulnerabilities": [
      {
         "cve": "CVE-2026-3255",
         "cwe": {
            "id": "CWE-338",
            "name": "Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)"
         },
         "notes": [
            {
               "category": "description",
               "text": "HTTP::Session2 versions before 1.12 for Perl for Perl may generate weak session ids using the rand() function.\n\nThe HTTP::Session2 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\nHTTP::Session2 after version 1.02 will attempt to use the /dev/urandom device to generate a session id, but if the device is unavailable (for example, under Windows), then it will revert to the insecure method described above.",
               "title": "Vulnerability Description"
            }
         ],
         "product_status": {
            "fixed": [
               "CSAFPID-0002"
            ],
            "known_affected": [
               "CSAFPID-0001"
            ]
         },
         "scores": [
            {
               "cvss_v3": {
                  "baseScore": 6.5,
                  "baseSeverity": "MEDIUM",
                  "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
                  "version": "3.1"
               },
               "products": [
                  "CSAFPID-0001"
               ]
            }
         ]
      }
   ]
}