ruby-css-parser: css_parser is a Ruby CSS parser
CVE-2026-53727 is fixed in ruby-css-parser on 1 platform by DEBIAN-CVE-2026-53727 (version 3.0.0-1), released July 19, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| ruby-css-parser · Debian 14 | 3.0.0-1 | DEBIAN-CVE-2026-53727 | Jul 19, 2026 |
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