Vulnerability details

Scriban before 6.6.0 contains an uncontrolled recursion vulnerability in its recursive-descent parser. The parser does not enforce a default expression depth limit (the ExpressionDepthLimit property in ParserOptions defaults to null/disabled), so an attacker who controls template input can supply a deeply nested template (e.g., thousands of nested parentheses or blocks) that exhausts thread stack space and raises a StackOverflowException. Because a StackOverflowException cannot be caught in .NET, this causes immediate, unrecoverable termination of the hosting process, resulting in a denial of service. Applications that process untrusted or user-supplied templates can be exploited remotely without authentication.

• https://github.com/scriban/scriban/security/advisories/GHSA-wgh7-7m3c-fx25 vendor-advisory
• https://www.vulncheck.com/advisories/scriban-before-denial-of-service-via-uncontrolled-recursion third-party-advisory