Zmarkdown Server-Side Request Forgery (SSRF) in remark-download-imagesGHSA-mf74-qq7w-6j7v
GHSA-mf74-qq7w-6j7v is a security vulnerability in remark-images-download. A fix is available for remark-images-download — see the affected versions and patch details below.
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.
remark-images-downloadnpmDescription
Impact
A major blind SSRF has been found in remark-images-download, which allowed
for requests to be made to neighboring servers on local IP ranges.
The issue came from a loose filtering of URLs inside the module.
Imagine a server running on a private network 192.168.1.0/24.
A private service serving images is running on 192.168.1.2, and
is not expected to be accessed by users. A machine is running
remark-images-download on the neighboring 192.168.1.3 host.
An user enters the following Markdown:
The image is downloaded by the server and included inside the resulting document. Hence, the user has access to the private image.
It has been corrected by preventing images downloads from local IP ranges, both in IPv4 and IPv6. To avoid malicious domain names, resolved local IPs from are also forbidden inside the module. This vulnerability impact is moderate, as it is can allow access to unexposed documents on the local network, and is very easy to exploit.
Patches
The vulnerability has been patched in version 3.1.0. If impacted, you should update to this version as soon as possible.
Please note that a minor version has been released instead of a bugfix. This is due to a new option included to prevent another vulnerability, upgrading to the new version will not break compatibility.
Workarounds
No workaround is known, the package should be upgraded.
For more information
If you have any questions or comments about this advisory, open an issue in ZMarkdown.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | remark-images-download | all versions | 3.1.0npm install remark-images-download@3.1.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for remark-images-download, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update remark-images-download to 3.1.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-mf74-qq7w-6j7v is resolved across your whole dependency graph.
Workarounds
Restrict outbound requests from the affected component to an allowlist of hosts, block access to link-local and internal address ranges at the network layer, and require authentication on internal services so a forged request cannot reach them unauthenticated.
Frequently Asked Questions
Is GHSA-mf74-qq7w-6j7v in your dependencies?
Find it across npm, including transitive dependencies.