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CVE-2026-44312

5.8 · MEDIUM

css_parser is a Ruby CSS parser.

Published May 14, 2026CWE-295EPSS 0.24%

Overview

CVE-2026-44312 is a medium-severity vulnerability. It was published on May 14, 2026 and has a CVSS 3.1 base score of 5.8 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.8, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/premailer/css_parser/commit/35e689c904225add78e0c488cf04bad052666449GitHubgithub.com/premailer/css_parser/commit/e0c95d5abe91b237becb90ff316531a6547ada18GitHubgithub.com/premailer/css_parser/issues/185GitHubgithub.com/premailer/css_parser/security/advisories/GHSA-ff6c-w6qf-7xqcGitHubgithub.com/premailer/css_parser/security/advisories/GHSA-ff6c-w6qf-7xqc

How CyberStrike helps

Frequently asked questions

What is CVE-2026-44312?

CVE-2026-44312 is a medium-severity vulnerability. It was published on May 14, 2026 and has a CVSS 3.1 base score of 5.8 (MEDIUM).

How severe is CVE-2026-44312?

This vulnerability has a CVSS 3.1 base score of 5.8, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-44312?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-44312?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-44312 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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