CVE-2026-8503

{
  "id": "CVE-2026-8503",
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "published": "2026-05-15T12:17:09.557",
  "lastModified": "2026-10-26T14:10:00.130",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Apache::Session::Generate::SHA256 versions before 1.3.19 for Perl create insecure session ids.\n\nApache::Session::Generate::SHA256 generated session ids insecurely. The default session id generator returns a SHA-256 hash of the built-in rand() function, the epoch time, and the PID, that is hashed again. These are predictable, low-entropy sources. Predicable session ids could allow an attacker to gain access to systems.\n\nNote that version 1.3.19 has a fallback without warning to use insecure session generation method if the call to Crypt::URandom::urandom fails. However, this is unlikely as Crypt::URandom is a hardcoded requirement of the module.\n\nThis issue is similar to CVE-2025-40931 for Apache::Session::Generate::MD5."
    },
    {
      "lang": "es",
      "value": "Las versiones de Apache::Session::Generate::SHA256 anteriores a la 1.3.19 para Perl crean identificadores de sesión inseguros.\n\nApache::Session::Generate::SHA256 generaba identificadores de sesión de forma insegura. El generador predeterminado de identificadores de sesión devuelve un hash SHA-256 de la función rand() incorporada, el tiempo de época y el PID, que se vuelve a aplicar hash. Estas son fuentes predecibles y de baja entropía. Los identificadores de sesión predecibles podrían permitir a un atacante obtener acceso a los sistemas.\n\nTenga en cuenta que la versión 1.3.19 tiene un mecanismo de reserva sin advertencia para usar un método de generación de sesión inseguro si la llamada a Crypt::URandom::urandom falla. Sin embargo, esto es poco probable ya que Crypt::URandom es un requisito fijo del módulo.\n\nEste problema es similar a CVE-2025-40931 para Apache::Session::Generate::MD5."
    }
  ],
  "affected": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "affectedData": [
        {
          "vendor": "GUIMARD",
          "product": "Apache::Session::Generate::SHA256",
          "defaultStatus": "unaffected",
          "collectionURL": "https://cpan.org/modules",
          "packageName": "Apache-Session-Browsable",
          "programFiles": [
            "lib/Apache/Session/Generate/SHA256.pm"
          ],
          "programRoutines": [
            {
              "name": "Apache::Session::Generate::SHA256#generate"
            }
          ],
          "repo": "https://github.com/LemonLDAPNG/Apache-Session-Browseable",
          "versions": [
            {
              "version": "0",
              "lessThan": "1.3.19",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.5
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-05-15T15:36:59.141220Z",
          "id": "CVE-2026-8503",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-338"
        },
        {
          "lang": "en",
          "value": "CWE-340"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:guimard:apache\\:\\:session\\:\\:generate\\:\\:sha256:*:*:*:*:*:perl:*:*",
              "versionEndExcluding": "1.3.19",
              "matchCriteriaId": "22FCEB1A-DF59-4660-A23B-389E42133610"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/LemonLDAPNG/Apache-Session-Browseable/commit/cc915cbbd266776eec3dd8bf4748b15fa827dbd0.patch",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://metacpan.org/release/GUIMARD/Apache-Session-Browseable-1.3.19/changes",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Release Notes"
      ]
    },
    {
      "url": "https://metacpan.org/release/GUIMARD/Apache-Session-Browseable-1.3.19/diff/GUIMARD/Apache-Session-Browseable-1.3.18#lib/Apache/Session/Generate/SHA256.pm",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Product"
      ]
    },
    {
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-40931",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-40932",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Third Party Advisory"
      ]
    }
  ]
}