CVE-2026-53727

{"id": "CVE-2026-53727", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53727", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-20T13:48:25.291408Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 8.6, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 4.0, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 8.9, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "premailer", "product": "css_parser", "versions": [{"status": "affected", "version": "< 3.0.0"}]}]}], "published": "2026-07-17T21:17:07.837", "references": [{"url": "https://github.com/premailer/css_parser/commit/7d2ddf0189cd54b54f378f59daefa10cb036e476", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/premailer/css_parser/commit/e0a151458b2a801ae265ba420862ef8b1127b3ae", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/premailer/css_parser/releases/tag/v3.0.0", "tags": ["Product"], "source": "security-advisories@github.com"}, {"url": "https://github.com/premailer/css_parser/security/advisories/GHSA-9pmc-p236-855h", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/premailer/css_parser/security/advisories/GHSA-9pmc-p236-855h", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-918"}]}], "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."}], "lastModified": "2026-10-24T20:10:00.137", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:premailer:css_parser:2.2.0:*:*:*:*:ruby:*:*", "vulnerable": true, "matchCriteriaId": "845B36E8-8A69-458D-8344-41134DF4036D"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}