CVE-2026-44312

{
  "id": "CVE-2026-44312",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-14T17:16:22.393",
  "lastModified": "2026-10-26T14:10:00.130",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "css_parser is a Ruby CSS parser. Prior to 2.1.0 and 1.22.0, the CSS Parser gem does not validate HTTPS connections, allowing a Man-in-the-Middle (MITM) attacker to inject or modify CSS content when stylesheets are loaded via HTTPS. The connection is established with OpenSSL::SSL::VERIFY_NONE, meaning any HTTPS certificate—even entirely untrusted—will be accepted without validation. This vulnerability is fixed in 2.1.0 and 1.22.0."
    },
    {
      "lang": "es",
      "value": "css_parser es un analizador CSS de Ruby. Antes de las versiones 2.1.0 y 1.22.0, la gema CSS Parser no valida las conexiones HTTPS, permitiendo a un atacante man-in-the-middle (MitM) inyectar o modificar contenido CSS cuando las hojas de estilo se cargan a través de HTTPS. La conexión se establece con OpenSSL::SSL::VERIFY_NONE, lo que significa que cualquier certificado HTTPS -incluso los completamente no confiables- será aceptado sin validación. Esta vulnerabilidad está corregida en las versiones 2.1.0 y 1.22.0."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "premailer",
          "product": "css_parser",
          "versions": [
            {
              "version": ">= 2.0.0, < 2.1.0",
              "status": "affected"
            },
            {
              "version": "< 1.22.0",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
          "baseScore": 5.8,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-05-15T18:05:24.647346Z",
          "id": "CVE-2026-44312",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        },
        {
          "lang": "en",
          "value": "CWE-829"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/premailer/css_parser/commit/35e689c904225add78e0c488cf04bad052666449",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/premailer/css_parser/commit/e0c95d5abe91b237becb90ff316531a6547ada18",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/premailer/css_parser/issues/185",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/premailer/css_parser/security/advisories/GHSA-ff6c-w6qf-7xqc",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/premailer/css_parser/security/advisories/GHSA-ff6c-w6qf-7xqc",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}