FKIE_CVE-2025-40926

Vulnerability from fkie_nvd - Published: 2026-03-05 02:16 - Updated: 2026-03-12 00:16
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
Plack::Middleware::Session::Simple versions before 0.05 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. Predictable 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.
References
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://github.com/kazeburo/Plack-Middleware-Session-Simple/commit/760bb358b8f53e52cf415888a4ac858fd99bb24e.patchPatch
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://github.com/kazeburo/Plack-Middleware-Session-Simple/pull/4Issue Tracking, Patch
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://metacpan.org/release/KAZEBURO/Plack-Middleware-Session-Simple-0.04/source/lib/Plack/Middleware/Session/Simple.pm#L43Issue Tracking, Product
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://metacpan.org/release/KAZEBURO/Plack-Middleware-Session-Simple-0.05/changes
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://security.metacpan.org/docs/guides/random-data-for-security.htmlThird Party Advisory
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://www.cve.org/CVERecord?id=CVE-2025-40923Third Party Advisory
Impacted products
Vendor Product Version
kazeburo plack\ \
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:kazeburo:plack\\:\\:middleware\\:\\:session\\:\\:simple:*:*:*:*:*:perl:*:*",
              "matchCriteriaId": "B99A5199-295A-487A-95D0-2DDF94AFDE71",
              "versionEndExcluding": "0.05",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "Las versiones de Plack::Middleware::Session::Simple hasta la 0.04 para Perl generan identificadores de sesi\u00f3n de forma insegura.\n\nEl generador predeterminado de identificadores de sesi\u00f3n devuelve un hash SHA-1 inicializado con la funci\u00f3n rand incorporada, el tiempo epoch y el PID. El PID provendr\u00e1 de un peque\u00f1o conjunto de n\u00fameros, y el tiempo epoch puede ser adivinado, si no se filtra del encabezado HTTP Date. La funci\u00f3n rand incorporada no es adecuada para uso criptogr\u00e1fico.\n\nLos identificadores de sesi\u00f3n predecibles podr\u00edan permitir a un atacante obtener acceso a los sistemas.\n\nPlack::Middleware::Session::Simple est\u00e1 dise\u00f1ado para ser compatible con Plack::Middleware::Session, que tuvo un problema de seguridad similar CVE-2025-40923."
    }
  ],
  "id": "CVE-2025-40926",
  "lastModified": "2026-03-12T00:16:10.650",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-03-05T02:16:39.790",
  "references": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/kazeburo/Plack-Middleware-Session-Simple/commit/760bb358b8f53e52cf415888a4ac858fd99bb24e.patch"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/kazeburo/Plack-Middleware-Session-Simple/pull/4"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Issue Tracking",
        "Product"
      ],
      "url": "https://metacpan.org/release/KAZEBURO/Plack-Middleware-Session-Simple-0.04/source/lib/Plack/Middleware/Session/Simple.pm#L43"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://metacpan.org/release/KAZEBURO/Plack-Middleware-Session-Simple-0.05/changes"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.metacpan.org/docs/guides/random-data-for-security.html"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-40923"
    }
  ],
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-338"
        },
        {
          "lang": "en",
          "value": "CWE-340"
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary"
    }
  ]
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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