GHSA-pvrw-g6fx-mcx2

is_js vulnerable to Regular Expression Denial of Service

Source: GitHub Advisory Database (reviewed) High CVE-2020-26302

Packages

Ecosystem	Package	Affected	Fixed in
npm	is_js	<= 0.9.0	no fix listed

Details

As written in the advisory (Markdown source, shown as plain text).

is.js is a general-purpose check library. Versions 0.9.0 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). is.js uses a regex copy-pasted from a gist to validate URLs. Trying to validate a malicious string can cause the regex to loop "forever." This vulnerability was found using a CodeQL query which identifies inefficient regular expressions. is.js has no patch for this issue.

References

External links from the advisory. They lead to third-party sites.

https://nvd.nist.gov/vuln/detail/CVE-2020-26302 advisory
https://github.com/arasatasaygin/is.js/issues/320 web
https://github.com/arasatasaygin/is.js package
https://securitylab.github.com/advisories/GHSL-2020-295-redos-is.js advisory