🛡️ CVE-2026-44312
🟡 CVSS 5.8 — Medium ✅ No Known Exploit CWE-295 NVD
5.8
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity Medium
CVSS Score 5.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
CWE CWE-295
Public Exploit âś… No
Source NVD
Published 2026-05-07
Updated 2026-06-15
Modified 2026-06-08
Fix URL N/A

Affected Packages

Software From version Fixed in
css-parser — 1.22.0
unknown — —

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