| Name | CVE-2026-53727 |
| 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| ruby-css-parser (PTS) | bullseye | 1.6.0-1 | vulnerable |
| bookworm | 1.6.0-2+deb12u1 | vulnerable | |
| trixie | 1.19.0-1+deb13u1 | vulnerable | |
| forky, sid | 3.0.0-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| ruby-css-parser | source | (unstable) | 3.0.0-1 |
https://github.com/premailer/css_parser/security/advisories/GHSA-9pmc-p236-855h
Fixed by: https://github.com/premailer/css_parser/commit/7d2ddf0189cd54b54f378f59daefa10cb036e476 (v3.0.0)
Fixed by: https://github.com/premailer/css_parser/commit/e0a151458b2a801ae265ba420862ef8b1127b3ae (v3.0.0)