CVE-2026-44312

The record

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.

Affected packages

Related vulnerabilities

• CVE-2026-96375 Improper Certificate Validation vulnerability in Drupal Cloud allows Adversary in the… CWE-295
• CVE-2026-87944 Improper Certificate Validation vulnerability in Drupal SAML SSO - Service Provider… CWE-295
• CVE-2026-114642 Traefik 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 stores its NTLM/Kerberos backend… CWE-295
• CVE-2026-114406 The system certificate authority (CA) store in Red Hat products, distributed via… CWE-295
• CVE-2026-95210 Improper certificate validation in gnutls v3.8.13 causes the application to accept… CWE-295
• CVE-2026-97687 urllib3 is an HTTP client library for Python. CWE-295
• CVE-2026-101916 @grpc/grpc-js implements the core functionality of gRPC purely in JavaScript, without a… CWE-295
• CVE-2026-63374 AnyIO is a high level asynchronous concurrency and networking framework that works on top… CWE-295