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CVE-2024-34078— html-sanitizer allows arbitrary HTML present after sanitization because of unicode normalization

Quick assessment

Affected
matthiask html-sanitizer
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.

HTML sanitizer是Matthias Kestenholz个人开发者的一个基于 allowlist 的 HTML 清理程序。 HTML sanitizer存在安全漏洞，该漏洞源于特制的 HTML 能够逃避清理。

CVSS 6.1 · Medium EPSS 0.55% · P44

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2024-34078

Vulnerability Information
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Vulnerability Title
html-sanitizer allows arbitrary HTML present after sanitization because of unicode normalization
Source: CVE Program / CVE List V5
Vulnerability Description
html-sanitizer is an allowlist-based HTML cleaner. If using `keep_typographic_whitespace=False` (which is the default), the sanitizer normalizes unicode to the NFKC form at the end. Some unicode characters normalize to chevrons; this allows specially crafted HTML to escape sanitization. The problem has been fixed in 2.4.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
HTML sanitizer 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HTML sanitizer是Matthias Kestenholz个人开发者的一个基于 allowlist 的 HTML 清理程序。 HTML sanitizer存在安全漏洞，该漏洞源于特制的 HTML 能够逃避清理。
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

Vendor Product Affected Versions CPE Subscribe
matthiask html-sanitizer < 2.4.2 -

II. Public POCs for CVE-2024-34078

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III. Intelligence Information for CVE-2024-34078

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Patches & Fixes for CVE-2024-34078 (1)

Vendor Advisories for CVE-2024-34078 (1)

IV. Related Vulnerabilities

Same product: html-sanitizer
Same weakness: CWE-79

V. Comments for CVE-2024-34078

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