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CVE-2026-44312

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CVE-2026-44312

Published: May 14, 2026

Modified: May 15, 2026

PUBLISHED

CVSS v3.1

5.8

MEDIUM

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.

VendorProductVersions

premailer

css_parser

affected
>= 2.0.0, < 2.1.0
affected
< 1.22.0

Weaknesses (CWE)

CWE-829
CWE-295

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

Low

Availability

None

References

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