Ruby CSS Parser: SSRF and Local File Disclosure in `CssParser::Parser#read_remote_file`
High-risk advisory
CVE-2026-53727
Summary
Ruby CSS Parser: SSRF and Local File Disclosure in `CssParser::Parser#read_remote_file`
Why it matters
GitHub has published a reviewed security advisory for css_parser. Prioritize it with other application dependency updates.
Operator check
Check whether css_parser is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. CVSS score: 8.9.
Sources
PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.