CVE-2026-44312

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.

• CWE-295
• CWE-829

• https://github.com/premailer/css_parser/commit/35e689c904225add78e0c488cf04bad052666449
• https://github.com/premailer/css_parser/commit/e0c95d5abe91b237becb90ff316531a6547ada18
• https://github.com/premailer/css_parser/issues/185
• https://github.com/premailer/css_parser/security/advisories/GHSA-ff6c-w6qf-7xqc
• https://github.com/premailer/css_parser/security/advisories/GHSA-ff6c-w6qf-7xqc

Published

May 14, 2026

Last Modified

Jun 17, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-44307Mako is a template library written in Python. Prior to 1.3.1…8.7
• CVE-2026-44308Spring Cloud AWS simplifies using AWS managed services in a …6.3
• CVE-2026-44309Gitsign is a keyless Sigstore to signing tool for Git commit…5.3
• CVE-2026-4431The Easy Post Submission plugin for WordPress is vulnerable …9.1
• CVE-2026-44310Gitsign is a keyless Sigstore to signing tool for Git commit…5.4
• CVE-2026-44311Fabric.js is a Javascript HTML5 canvas library. Prior to 7.4…6.1
• CVE-2026-44313Linkwarden is a self-hosted, open-source collaborative bookm…9.1
• CVE-2026-44314Traccar is an open source GPS tracking system. Prior to 6.13…4.3
• CVE-2026-44315free5GC is an open-source implementation of the 5G core netw…9.4
• CVE-2026-44316free5GC is an open-source implementation of the 5G core netw…7.5
• CVE-2026-44317free5GC is an open-source implementation of the 5G core netw…6.5
• CVE-2026-44318free5GC is an open-source implementation of the 5G core netw…5.3