DEBIAN-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 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.
DEBIAN-CVE-2026-53727
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-53727
ruby-css-parser
Source reference: /affected/0/package/name
- Affected versions
- 1.16.0-1
Source reference:
/affected/0/versions1.19.0-1Source reference:
/affected/0/versions1.21.1-1Source reference:
/affected/0/versions1.6.0-2Source reference:
/affected/0/versions1.6.0-2+deb12u1Source reference:
/affected/0/versions2.0.0-1Source reference:
/affected/0/versions2.1.0-1Source reference:
/affected/0/versions3.0.0-1Source reference:
/affected/0/versions3.1.0-1Source reference:
/affected/0/versions3.3.0-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
ruby-css-parser
Source reference: /affected/1/package/name
- Affected versions
- 1.19.0-1
Source reference:
/affected/1/versions1.19.0-1+deb13u1Source reference:
/affected/1/versions1.21.1-1Source reference:
/affected/1/versions2.0.0-1Source reference:
/affected/1/versions2.1.0-1Source reference:
/affected/1/versions3.0.0-1Source reference:
/affected/1/versions3.1.0-1Source reference:
/affected/1/versions3.3.0-1Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
ruby-css-parser
Source reference: /affected/2/package/name
- Affected versions
- 1.19.0-1
Source reference:
/affected/2/versions1.21.1-1Source reference:
/affected/2/versions2.0.0-1Source reference:
/affected/2/versions2.1.0-1Source reference:
/affected/2/versions - Fixed versions
- 3.0.0-1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "ruby-css-parser",
"purl": "pkg:deb/debian/ruby-css-parser?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1.16.0-1",
"1.19.0-1",
"1.21.1-1",
"1.6.0-2",
"1.6.0-2+deb12u1",
"2.0.0-1",
"2.1.0-1",
"3.0.0-1",
"3.1.0-1",
"3.3.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53727.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "ruby-css-parser",
"purl": "pkg:deb/debian/ruby-css-parser?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.19.0-1",
"1.19.0-1+deb13u1",
"1.21.1-1",
"2.0.0-1",
"2.1.0-1",
"3.0.0-1",
"3.1.0-1",
"3.3.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53727.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.0.0-1"
}
]
}
],
"package": {
"name": "ruby-css-parser",
"purl": "pkg:deb/debian/ruby-css-parser?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.19.0-1",
"1.21.1-1",
"2.0.0-1",
"2.1.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53727.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57339 · Revision 1
- Added to Heist Feed
- Publisher date