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CVE-2023-4241— lol-html panics on certain HTML inputs

Quick assessment

Affected
Cloudflare lol-html
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LOL HTML是Cloudflare开源的一个低输出延迟流式 HTML 重写器/解析器。 LOL HTML 1.1.1之前版本存在安全漏洞，该漏洞源于lol-html会导致某些HTML输入崩溃。

CVSS 7.5 · High EPSS 0.69% · P51

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2023-4241

Vulnerability Information
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Vulnerability Title
lol-html panics on certain HTML inputs
Source: CVE Program / CVE List V5
Vulnerability Description
lol-html can cause panics on certain HTML inputs. Anyone processing arbitrary 3rd party HTML with the library is affected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
LOL HTML 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LOL HTML是Cloudflare开源的一个低输出延迟流式 HTML 重写器/解析器。 LOL HTML 1.1.1之前版本存在安全漏洞，该漏洞源于lol-html会导致某些HTML输入崩溃。
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
Cloudflare lol-html 0 ~ 1.1.1 -

II. Public POCs for CVE-2023-4241

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6342 chars
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III. Intelligence Information for CVE-2023-4241

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Vendor Advisories for CVE-2023-4241 (1)

IV. Related Vulnerabilities

Same vendor: Cloudflare
Same weakness: CWE-20

V. Comments for CVE-2023-4241

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