CVE-2026-53727 - css_parser: SSRF and Local File Disclosure in `CssParser::Parser#read_remote_file`

CVE-2026-53727 - css_parser: SSRF and Local File Disclosure in `CssParser::Parser#read_remote_file`

https://cvefeed.io/rssfeed/latest.atom / Sat, 07/18/2026 - 04:06
CVE ID :CVE-2026-53727
Published : July 17, 2026, 9:17 p.m. | 3 hours, 31 minutes ago
Description :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.
Severity: 8.9 | HIGH
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