ruby-css-parser: css_parser is a Ruby CSS parser
CVE-2026-44312 is fixed in ruby-css-parser on 1 platform, first by DEBIAN-CVE-2026-44312, released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.
css_parser is a Ruby CSS parser. Prior to 2.1.0 and 1.22.0, the CSS Parser gem does not validate HTTPS connections, allowing a Man-in-the-Middle (MITM) attacker to inject or modify CSS content when stylesheets are loaded via HTTPS. The connection is established with OpenSSL::SSL::VERIFY_NONE, meaning any HTTPS certificate—even entirely untrusted—will be accepted without validation. This vulnerability is fixed in 2.1.0 and 1.22.0.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| ruby-css-parser · Debian 12.15 (bookworm) | 1.6.0-2+deb12u1 | DEBIAN-CVE-2026-44312 | May 15, 2026 |
| ruby-css-parser · Debian 13.5 (trixie) | 1.19.0-1+deb13u1 | DEBIAN-CVE-2026-44312 | May 15, 2026 |
| ruby-css-parser · Debian 14 | 2.1.0-1 | DEBIAN-CVE-2026-44312 | May 15, 2026 |
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