# LLMs Make Fuzzing Harnesses Obsolete: Why AI Security Test Automation Unicorns Emerge

- Link: https://arstechnica.com/information-technology/2026/05/mozilla-says-271-vulnerabilities-found-by-mythos-have-almost-no-false-positives/
- Discussion: https://startupxo.com/en/341/
- Posted by mrlatte at 2026-05-08T09:00:00.000Z
- 1 point, 0 comments, kind story, origin archive
- Written in ko, machine translated to en

## Summary

- Anthropic's Mythos Preview discovered 271 vulnerabilities in Firefox 150, and around the same time, XBOW became a unicorn with a $155 million Series C funding.
- The investment rationale is that instead of humans writing fuzzing harnesses for each API, a bottleneck, LLMs read code and generate hypotheses to bypass this step.
- However, linking reproduction, false positive filtering, and review of fixes is another product challenge, so saying harnesses will disappear is premature.

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