CVE-2026-53727

cssparser is a Ruby CSS parser. From 2.2.0 until 3.0.0, CssParser::Parserreadremotefile in lib/cssparser/parser.rb, and therefore loaduri! and the @import-following branch of addblock!, issued HTTP and HTTPS requests against any host, port, and URI without a scheme allowlist, host or IP filtering...

CVE-2026-53727

Summary: Multiple sources confirm a vulnerability in css_parser prior to 3.0.0 where CssParser::Parser#read_remote_file, Parser#load_uri!, and Parser#add_block! follow HTTP(S) redirects and even service file:// URIs without proper host/scheme filtering, enabling SSRF to internal hosts and potenti...

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

cssparser is a Ruby CSS parser. From 2.2.0 until 3.0.0, CssParser::Parserreadremotefile in lib/cssparser/parser.rb, and therefore loaduri! and the @import-following branch of addblock!, issued HTTP and HTTPS requests against any host, port, and URI without a scheme allowlist, host or IP filtering...

Ruby CSS Parser: SSRF and Local File Disclosure in `CssParser::Parser#read_remote_file`

Summary CssParser::Parserreadremotefile and therefore loaduri!, and the @import-following branch of addblock! issues HTTP/HTTPS requests against any host, port and URI it is handed, with no scheme allowlist, no host / IP filtering, and no protection against link-local, loopback or RFC‑1918...

GHSA-9PMC-P236-855H Ruby CSS Parser: SSRF and Local File Disclosure in `CssParser::Parser#read_remote_file`

Summary CssParser::Parserreadremotefile and therefore loaduri!, and the @import-following branch of addblock! issues HTTP/HTTPS requests against any host, port and URI it is handed, with no scheme allowlist, no host / IP filtering, and no protection against link-local, loopback or RFC‑1918...

Server-side Request Forgery (SSRF)

Overview Affected versions of this package are vulnerable to Server-side Request Forgery SSRF via the readremotefile function. An attacker can access internal network resources or disclose arbitrary local files by supplying a crafted CSS file containing a malicious @import url... directive, which...