{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53727","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-10T16:43:31.242Z","datePublished":"2026-07-17T20:30:37.291Z","dateUpdated":"2026-07-20T13:48:30.250Z"},"containers":{"cna":{"title":"css_parser: SSRF and Local File Disclosure in `CssParser::Parser#read_remote_file`","problemTypes":[{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"CWE-918: Server-Side Request Forgery (SSRF)","type":"CWE"}]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.9,"baseSeverity":"HIGH","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","version":"4.0"}}],"references":[{"name":"https://github.com/premailer/css_parser/security/advisories/GHSA-9pmc-p236-855h","tags":["x_refsource_CONFIRM"],"url":"https://github.com/premailer/css_parser/security/advisories/GHSA-9pmc-p236-855h"},{"name":"https://github.com/premailer/css_parser/commit/7d2ddf0189cd54b54f378f59daefa10cb036e476","tags":["x_refsource_MISC"],"url":"https://github.com/premailer/css_parser/commit/7d2ddf0189cd54b54f378f59daefa10cb036e476"},{"name":"https://github.com/premailer/css_parser/commit/e0a151458b2a801ae265ba420862ef8b1127b3ae","tags":["x_refsource_MISC"],"url":"https://github.com/premailer/css_parser/commit/e0a151458b2a801ae265ba420862ef8b1127b3ae"},{"name":"https://github.com/premailer/css_parser/releases/tag/v3.0.0","tags":["x_refsource_MISC"],"url":"https://github.com/premailer/css_parser/releases/tag/v3.0.0"}],"affected":[{"vendor":"premailer","product":"css_parser","versions":[{"version":"< 3.0.0","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-07-17T20:30:37.291Z"},"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."}],"source":{"advisory":"GHSA-9pmc-p236-855h","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/premailer/css_parser/security/advisories/GHSA-9pmc-p236-855h","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-20T13:48:25.291408Z","id":"CVE-2026-53727","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-20T13:48:30.250Z"}}]}}