Developer builds execution-based vulnerability scanner that verifies fixes before claiming success

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A developer created an open-source tool called secfix that validates security vulnerabilities and their fixes through actual code execution rather than static pattern-matching. Unlike conventional scanners, secfix runs flagged code inside a Docker sandbox using a tainted marker to confirm whether a vulnerability is genuinely exploitable. A proposed fix is only marked as validated if a fresh execution trace proves the tainted input is no longer reaching a dangerous endpoint. Testing against real Django applications revealed significant challenges, including the need to manually supply framework-specific context such as database rows and internal configuration thresholds. The developer has published the code and a detailed account of the tool's limitations on GitHub, framing the honest boundary of execution-based scanning as the project's core contribution.

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