CVEvulnerability
CVE-2026-44312
5.8 MEDIUM
Official page ↗
- Status
- Deferred
- Published
- 2026-05-14
- Last modified
- 2026-10-26
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 5.8 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
- Weaknesses
- CWE-295, CWE-829
Description
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.
Related
References
- https://github.com/premailer/css_parser/commit/35e689c904225add78e0c488cf04bad052666449 github.com
- https://github.com/premailer/css_parser/commit/e0c95d5abe91b237becb90ff316531a6547ada18 github.com
- https://github.com/premailer/css_parser/issues/185 github.com
- https://github.com/premailer/css_parser/security/advisories/GHSA-ff6c-w6qf-7xqc github.com
- https://github.com/premailer/css_parser/security/advisories/GHSA-ff6c-w6qf-7xqc github.com