CVE Explorer
CVE-2026-53727
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 attack
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"css_parser","vendor":"premailer","versions":[{"status":"affected","version":"< 3.0.0"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:aeed81a374c4e6562b6fade7177766f7db3fb06c388faf0f3ec96c18a501c7f7 · sha256:f7412204113f3fff… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.9,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"NONE","userInteraction":"NONE","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","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:aeed81a374c4e6562b6fade7177766f7db3fb06c388faf0f3ec96c18a501c7f7 · sha256:f7412204113f3fff… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-918","description":"CWE-918: Server-Side Request Forgery (SSRF)","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:aeed81a374c4e6562b6fade7177766f7db3fb06c388faf0f3ec96c18a501c7f7 · sha256:f7412204113f3fff… · /containers/cna/problemTypes/0/descriptions/0
Source references
5 source assertions{"name":"https://github.com/premailer/css_parser/commit/7d2ddf0189cd54b54f378f59daefa10cb036e476","tags":["x_refsource_MISC"],"url":"https://github.com/premailer/css_parser/commit/7d2ddf0189cd54b54f378f59daefa10cb036e476"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:aeed81a374c4e6562b6fade7177766f7db3fb06c388faf0f3ec96c18a501c7f7 · sha256:f7412204113f3fff… · /containers/cna/references/1
{"name":"https://github.com/premailer/css_parser/commit/e0a151458b2a801ae265ba420862ef8b1127b3ae","tags":["x_refsource_MISC"],"url":"https://github.com/premailer/css_parser/commit/e0a151458b2a801ae265ba420862ef8b1127b3ae"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:aeed81a374c4e6562b6fade7177766f7db3fb06c388faf0f3ec96c18a501c7f7 · sha256:f7412204113f3fff… · /containers/cna/references/2
{"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"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:aeed81a374c4e6562b6fade7177766f7db3fb06c388faf0f3ec96c18a501c7f7 · sha256:f7412204113f3fff… · /containers/cna/references/3
{"tags":["exploit"],"url":"https://github.com/premailer/css_parser/security/advisories/GHSA-9pmc-p236-855h"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:aeed81a374c4e6562b6fade7177766f7db3fb06c388faf0f3ec96c18a501c7f7 · sha256:f7412204113f3fff… · /containers/adp/0/references/0
{"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"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:aeed81a374c4e6562b6fade7177766f7db3fb06c388faf0f3ec96c18a501c7f7 · sha256:f7412204113f3fff… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.