CVE-2021-39199
Unsafe defaults in `remark-html`
Impact
### 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 [security@unifiedjs.com](mailto:security@unifiedjs.com)
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | remark-html | < 13.0.2 | 13.0.2 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Remark | Remark-Html | before 13.0.2 from 14.0.0 before 14.0.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/remarkjs/remark-html/commit/b75c9dde582ad87ba498e369c033dc8a350478c1
- https://github.com/remarkjs/remark-html/releases/tag/14.0.1
- https://github.com/remarkjs/remark-html/security/advisories/GHSA-9q5w-79cv-947m
- https://www.npmjs.com/package/remark-html
- https://github.com/advisories/GHSA-9q5w-79cv-947m
- https://nvd.nist.gov/vuln/detail/CVE-2021-39199