GHSA-9q5w-79cv-947m
Unsafe defaults in `remark-html`
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | remark-html | < 13.0.2 | 13.0.2 |
| npm | remark-html | >= 14.0.0, < 14.0.1 | 14.0.1 |
Details
As written in the advisory (Markdown source, shown as plain text).
### Impact
The documentation of `remark-html` has mentioned that it was safe by default. In practise the default was never safe and had to be opted into. This means arbitrary HTML can be passed through leading to potential XSS attacks.
### Patches
The problem has been patched in 13.0.2 and 14.0.1: `remark-html` is now safe by default, and the implementation matches the documentation.
### Workarounds
On older affected versions, pass `sanitize: true`, like so:
```diff
- .use(remarkHtml)
+ .use(remarkHtml, {sanitize: true})
```
### References
n/a
### For more information
If you have any questions or comments about this advisory:
* Open an issue in [`remark-html`](https://github.com/remarkjs/remark-html)
* Email us at [[email protected]](mailto:[email protected])
References
External links from the advisory. They lead to third-party sites.
- https://github.com/remarkjs/remark-html/security/advisories/GHSA-9q5w-79cv-947m
- https://nvd.nist.gov/vuln/detail/CVE-2021-39199
- https://github.com/remarkjs/remark-html/commit/b75c9dde582ad87ba498e369c033dc8a350478c1
- https://github.com/remarkjs/remark-html
- https://github.com/remarkjs/remark-html/releases/tag/14.0.1
- https://www.npmjs.com/package/remark-html