Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1000 CNY

100.0%
Buy Us a Coffee

CVE-2026-44312— css_parser allows to MITM included https css urls

CVSS 5.8 · Medium EPSS 0.02% · P4

Affected Version Matrix 2

VendorProductVersion RangeStatus
premailercss_parser>= 2.0.0, < 2.1.0affected
< 1.22.0affected
Get alerts for future matching vulnerabilitiesLog in to subscribe

I. Basic Information for CVE-2026-44312

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
css_parser allows to MITM included https css urls
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
从非可信控制范围包含功能例程
Source: NVD (National Vulnerability Database)
Vulnerability Title
Ruby CSS Parser 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ruby CSS Parser是premailer开源的一个用于加载、解析和级联CSS规则集的工具。 Ruby CSS Parser 2.1.0之前版本和1.22.0之前版本存在信任管理问题漏洞，该漏洞源于未验证HTTPS连接，使用OpenSSL::SSL::VERIFY_NONE建立连接，导致中间人攻击者可在通过HTTPS加载样式表时注入或修改CSS内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
premailercss_parser >= 2.0.0, < 2.1.0 -

II. Public POCs for CVE-2026-44312

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-44312

请登录查看更多情报信息。

IV. Related Vulnerabilities

Same weakness: CWE-829

V. Comments for CVE-2026-44312

No comments yet

Leave a comment