Is CVE-2026-44312 actively exploited?

No active exploitation of CVE-2026-44312 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-44312 be exploited remotely?

Yes. CVE-2026-44312 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-44312?

CVE-2026-44312 has a CVSS score of 5.8 (MEDIUM).

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MEDIUM

CVE-2026-44312

CWE-295Published: May 14, 2026· Updated: May 15, 2026

5.8

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:3.9th

Official 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.

NVD Source

Technical Analysis

CVE-2026-44312 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.