Finding More Zero Days Through Variant Analysis

Semgrep's blog post, "Finding More Zero Days Through Variant Analysis," authored by Eugene Lim, delves into leveraging root cause analysis of known vulnerabilities to identify similar flaws within the same codebase. By examining patch diffs and CVE advisories, researchers can pinpoint recurring coding patterns that may lead to multiple vulnerabilities. This approach enables the creation of targeted Semgrep rules to detect these variants, enhancing the efficiency of vulnerability discovery. Lim illustrates this method by analyzing integer overflow vulnerabilities in the Expat XML parsing library, demonstrating how understanding the underlying cause can facilitate the identification of related issues. 

https://semgrep.dev/blog/2025/finding-more-zero-days-through-variant-analysis/

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