CVE-2026-44312 — css_parser is a Ruby CSS parser. Prior to 2.1.0 and 1.22.0,

title: CVE-2026-44312 - Ruby css_parser Unvalidated HTTPS Connection
id: scw-2026-05-14-ai-1
status: experimental
level: medium
description: |
  Detects the use of OpenSSL::SSL::VERIFY_NONE when fetching CSS resources, indicating a potential Man-in-the-Middle attack targeting the css_parser gem (CVE-2026-44312) by allowing unvalidated HTTPS connections.
author: SCW Feed Engine (AI-generated)
date: 2026-05-14
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-44312/
tags:
  - attack.initial_access
  - attack.t1071.001
logsource:
    category: webserver
detection:
  selection:
      cs-uri|contains:
          - 'VERIFY_NONE'
      cs-method:
          - 'GET'
      sc-status:
          - '200'
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse