CVE-2020-26302: Inefficient Regular Expression Complexity

July 6, 2023

is.js is a general-purpose check library. Versions 0.9.0 and prior contain one or more regular expressions that is 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 â€œforever." This vulnerability was found using a CodeQL query which identifies inefficient regular expressions. is.js has no patch for this issue.

References

github.com/advisories/GHSA-pvrw-g6fx-mcx2
github.com/arasatasaygin/is.js/issues/320
nvd.nist.gov/vuln/detail/CVE-2020-26302
securitylab.github.com/advisories/GHSL-2020-295-redos-is.js

Code Behaviors & Features

Detect and mitigate CVE-2020-26302 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →