An exponential ReDoS (Regular Expression Denial of Service) can be triggered in the uri-template-lite npm package, when an attacker is able to supply arbitrary input to the "URI.expand" method.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-43309
• https://research.jfrog.com/vulnerabilities/uri-template-lite-redos-xray-211351/
• litejs/uri-template-lite@cbeec2b
• https://github.com/litejs/uri-template-lite/commits/v22.9.0