CVE-2026-53727

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{"affected": [{"affectedData": [{"product": "css_parser", "vendor": "premailer", "versions": [{"status": "affected", "version": "< 3.0.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:premailer:css_parser:2.2.0:*:*:*:*:ruby:*:*", "matchCriteriaId": "845B36E8-8A69-458D-8344-41134DF4036D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "css_parser es un analizador CSS de Ruby. Desde 2.2.0 hasta 3.0.0, CssParser::Parser#read_remote_file en lib/css_parser/parser.rb, y por lo tanto load_uri! y la rama de seguimiento de @import de add_block!, realizaba solicitudes HTTP y HTTPS contra cualquier host, puerto y URI sin una lista blanca de esquemas, filtrado de host o IP, o protecci\u00f3n contra direcciones link-local, loopback o RFC-1918. Las redirecciones \u2019Location:\u2019 se segu\u00edan recursivamente de vuelta a la misma funci\u00f3n, que tambi\u00e9n atend\u00eda URIs de tipo file: //, por lo que una \u00fanica redirecci\u00f3n HTTP controlada por el atacante podr\u00eda escalar el error de SSRF a divulgaci\u00f3n arbitraria de archivos locales. Cualquier consumidor de css_parser que le entrega CSS influenciado por el atacante junto con una opci\u00f3n \u2019base_uri:\u2019 est\u00e1 expuesto. Este problema se corrigi\u00f3 en la versi\u00f3n 3.0.0."}], "id": "CVE-2026-53727", "lastModified": "2026-10-24T20:10:00.137", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.0, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.9, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53727", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-20T13:48:25.291408Z", "version": "2.0.3"}}]}, "published": "2026-07-17T21:17:07.837", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/premailer/css_parser/commit/7d2ddf0189cd54b54f378f59daefa10cb036e476"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/premailer/css_parser/commit/e0a151458b2a801ae265ba420862ef8b1127b3ae"}, {"source": "security-advisories@github.com", "tags": ["Product"], "url": "https://github.com/premailer/css_parser/releases/tag/v3.0.0"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "url": "https://github.com/premailer/css_parser/security/advisories/GHSA-9pmc-p236-855h"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "url": "https://github.com/premailer/css_parser/security/advisories/GHSA-9pmc-p236-855h"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-918"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "css_parser: css_parser: Arbitrary local file disclosure via Server-Side Request Forgery", "id": "2501922", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2501922"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.6", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-918", "details": ["A flaw was found in css_parser, a Ruby CSS parser. This vulnerability allows a remote attacker to perform Server-Side Request Forgery (SSRF) by providing specially crafted CSS with a base Uniform Resource Identifier (URI) option. Successful exploitation can lead to arbitrary local file disclosure, as the parser can be tricked into following redirects to local file paths."], "name": "CVE-2026-53727", "package_state": [{"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Under investigation", "package_name": "3scale-amp21/system", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Under investigation", "package_name": "3scale-amp22/system", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Under investigation", "package_name": "3scale-amp2/system-rhel7", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Under investigation", "package_name": "3scale-amp2/system-rhel8", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Under investigation", "package_name": "3scale-amp2/system-rhel9", "product_name": "Red Hat 3scale API Management Platform 2"}], "public_date": "2026-07-17T20:30:37Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53727\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53727\nhttps://github.com/premailer/css_parser/commit/7d2ddf0189cd54b54f378f59daefa10cb036e476\nhttps://github.com/premailer/css_parser/commit/e0a151458b2a801ae265ba420862ef8b1127b3ae\nhttps://github.com/premailer/css_parser/releases/tag/v3.0.0\nhttps://github.com/premailer/css_parser/security/advisories/GHSA-9pmc-p236-855h"], "statement": "This flaw is rated as Important because it allows for Server-Side Request Forgery (SSRF) and potential arbitrary local file disclosure. Exploitation requires an application to process attacker-controlled CSS with a `base_uri` option, which is not a default configuration in most Red Hat products. This limits the attack surface to specific deployments where `css_parser` is used in a vulnerable manner.", "threat_severity": "Important"}

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