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    4 vulnerabilities by premailer

    CVE-2026-53727 (GCVE-0-2026-53727)

    Vulnerability from nvd – Published: 2026-07-17 20:30 – Updated: 2026-07-20 13:48
    VLAI
    Title
    css_parser: SSRF and Local File Disclosure in `CssParser::Parser#read_remote_file`
    Summary
    css_parser is a Ruby CSS parser. From 2.2.0 until 3.0.0, CssParser::Parser#read_remote_file in lib/css_parser/parser.rb, and therefore load_uri! and the @import-following branch of add_block!, issued HTTP and HTTPS requests against any host, port, and URI without a scheme allowlist, host or IP filtering, or protection against link-local, loopback, or RFC-1918 addresses. Location: redirects were followed recursively back into the same function, which also serviced file:// URIs, so a single attacker-controlled HTTP redirect could upgrade the bug from SSRF to arbitrary local file disclosure. Any consumer of css_parser that hands it attacker-influenced CSS together with a base_uri: option is exposed. This issue is fixed in version 3.0.0.
    Severity
    8.9 (High)
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-918 - Server-Side Request Forgery (SSRF)
    Assigner
    References
    Impacted products
    Vendor Product Version
    premailer css_parser Affected: < 3.0.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-44312 (GCVE-0-2026-44312)

    Vulnerability from nvd – Published: 2026-05-14 16:15 – Updated: 2026-05-15 18:05
    VLAI
    Title
    css_parser allows to MITM included https css urls
    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.
    Severity
    5.8 (Medium)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-829 - Inclusion of Functionality from Untrusted Control Sphere
    • CWE-295 - Improper Certificate Validation
    Assigner
    References
    Impacted products
    Vendor Product Version
    premailer css_parser Affected: >= 2.0.0, < 2.1.0
    Affected: < 1.22.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-53727 (GCVE-0-2026-53727)

    Vulnerability from cvelistv5 – Published: 2026-07-17 20:30 – Updated: 2026-07-20 13:48
    VLAI
    Title
    css_parser: SSRF and Local File Disclosure in `CssParser::Parser#read_remote_file`
    Summary
    css_parser is a Ruby CSS parser. From 2.2.0 until 3.0.0, CssParser::Parser#read_remote_file in lib/css_parser/parser.rb, and therefore load_uri! and the @import-following branch of add_block!, issued HTTP and HTTPS requests against any host, port, and URI without a scheme allowlist, host or IP filtering, or protection against link-local, loopback, or RFC-1918 addresses. Location: redirects were followed recursively back into the same function, which also serviced file:// URIs, so a single attacker-controlled HTTP redirect could upgrade the bug from SSRF to arbitrary local file disclosure. Any consumer of css_parser that hands it attacker-influenced CSS together with a base_uri: option is exposed. This issue is fixed in version 3.0.0.
    Severity
    8.9 (High)
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-918 - Server-Side Request Forgery (SSRF)
    Assigner
    References
    Impacted products
    Vendor Product Version
    premailer css_parser Affected: < 3.0.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-44312 (GCVE-0-2026-44312)

    Vulnerability from cvelistv5 – Published: 2026-05-14 16:15 – Updated: 2026-05-15 18:05
    VLAI
    Title
    css_parser allows to MITM included https css urls
    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.
    Severity
    5.8 (Medium)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-829 - Inclusion of Functionality from Untrusted Control Sphere
    • CWE-295 - Improper Certificate Validation
    Assigner
    References
    Impacted products
    Vendor Product Version
    premailer css_parser Affected: >= 2.0.0, < 2.1.0
    Affected: < 1.22.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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          "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-829",
              "description": "CWE-829: Inclusion of Functionality from Untrusted Control Sphere",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-295",
              "description": "CWE-295: Improper Certificate Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-14T16:15:04.907Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/premailer/css_parser/security/advisories/GHSA-ff6c-w6qf-7xqc",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/premailer/css_parser/security/advisories/GHSA-ff6c-w6qf-7xqc"
        },
        {
          "name": "https://github.com/premailer/css_parser/issues/185",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/premailer/css_parser/issues/185"
        },
        {
          "name": "https://github.com/premailer/css_parser/commit/35e689c904225add78e0c488cf04bad052666449",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/premailer/css_parser/commit/35e689c904225add78e0c488cf04bad052666449"
        },
        {
          "name": "https://github.com/premailer/css_parser/commit/e0c95d5abe91b237becb90ff316531a6547ada18",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/premailer/css_parser/commit/e0c95d5abe91b237becb90ff316531a6547ada18"
        }
      ],
      "source": {
        "advisory": "GHSA-ff6c-w6qf-7xqc",
        "discovery": "UNKNOWN"
      },
      "title": "css_parser allows to MITM included https css urls"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-44312",
    "datePublished": "2026-05-14T16:15:04.907Z",
    "dateReserved": "2026-05-05T19:00:06.022Z",
    "dateUpdated": "2026-05-15T18:05:54.862Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}