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.
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.
On older affected versions, pass sanitize: true
, like so:
- .use(remarkHtml)
+ .use(remarkHtml, {sanitize: true})
n/a
If you have any questions or comments about this advisory:
remark-html
github.com/remarkjs/remark-html
github.com/remarkjs/remark-html/commit/b75c9dde582ad87ba498e369c033dc8a350478c1
github.com/remarkjs/remark-html/releases/tag/14.0.1
github.com/remarkjs/remark-html/security/advisories/GHSA-9q5w-79cv-947m
nvd.nist.gov/vuln/detail/CVE-2021-39199
www.npmjs.com/package/remark-html