FKIE_CVE-2026-44312

Vulnerability from fkie_nvd - Published: 2026-05-14 17:16 - Updated: 2026-05-15 19:16
Severity
5.8 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Summary
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.
References
security-advisories@github.comhttps://github.com/premailer/css_parser/commit/35e689c904225add78e0c488cf04bad052666449
security-advisories@github.comhttps://github.com/premailer/css_parser/commit/e0c95d5abe91b237becb90ff316531a6547ada18
security-advisories@github.comhttps://github.com/premailer/css_parser/issues/185
security-advisories@github.comhttps://github.com/premailer/css_parser/security/advisories/GHSA-ff6c-w6qf-7xqc
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/premailer/css_parser/security/advisories/GHSA-ff6c-w6qf-7xqc
Impacted products
Vendor Product Version
To clipboard 

{
  "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\u2014even entirely untrusted\u2014will be accepted without validation. This vulnerability is fixed in 2.1.0 and 1.22.0."
    }
  ],
  "id": "CVE-2026-44312",
  "lastModified": "2026-05-15T19:16:59.240",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.8,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-05-14T17:16:22.393",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/premailer/css_parser/commit/35e689c904225add78e0c488cf04bad052666449"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/premailer/css_parser/commit/e0c95d5abe91b237becb90ff316531a6547ada18"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/premailer/css_parser/issues/185"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/premailer/css_parser/security/advisories/GHSA-ff6c-w6qf-7xqc"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/premailer/css_parser/security/advisories/GHSA-ff6c-w6qf-7xqc"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        },
        {
          "lang": "en",
          "value": "CWE-829"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}


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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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