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

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-116695— Crass: Incorrect tokenization of bad URLs enables CSS sanitizer bypass

Quick assessment

Affected
rgrove crass
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Crass 是一个符合 CSS 语法第 3 级规范的 Ruby CSS 解析器。在 1.0.8 版本之前，Crass 在处理包含不良 URL 的输入时，错误地将转义反斜杠后的右括号也视为已转义，从而未能正确终止该 URL 令牌。这导致 Crass 将本应被浏览器视为有效 CSS 的声明、样式规则或@规则保留在不良 URL 令牌内部。若某个清理程序使用 Crass 解析不可信的 CSS，并在未拒绝该不良 URL 的情况下将其重新序列化，则可能允许攻击者利用 CSS 进行界面重定向（UI redressing）、加载外

CVSS 5.3 · Medium EPSS 0.35% · P29

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
rgrove crass < 1.0.8 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-116695

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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
Crass: Incorrect tokenization of bad URLs enables CSS sanitizer bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Crass is a Ruby CSS parser that is compliant with the CSS Syntax Level 3 specification. Prior to 1.0.8, Crass incorrectly treats a closing parenthesis after an escaped backslash as escaped while consuming the remnants of a bad URL. Crass therefore keeps declarations, style rules, or at-rules inside a bad URL token even though a browser treats them as live CSS. A sanitizer that parses untrusted CSS with Crass and reserializes it without rejecting the bad URL can allow CSS used for UI redress, external resource loading, or CSS-based data exfiltration, but this issue does not enable script execution in modern browsers. This issue is fixed in version 1.0.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
解释冲突
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
rgrove crass < 1.0.8 -

II. Public POCs for CVE-2026-116695

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-116695

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-116695 (1)

Vendor Advisories for CVE-2026-116695 (1)

Vendor Pages for CVE-2026-116695 (1)

IV. Related Vulnerabilities

Same vendor: rgrove
Same weakness: CWE-436