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A terminal showing ls crashes | wc -l returning 12165, then wuppiefuzz dedup reducing them to 10 unique clusters. Three clusters are highlighted in red: a 500 on POST /items, an incorrect response object, and a possible injection signature. The other seven are UnexpectedContent on every endpoint.

12,165 Crashes in 60 Seconds: Fuzzing a REST API with WuppieFuzz

Most REST APIs ship with two kinds of tests: unit tests that check functions in isolation, and integration tests that walk the happy path. “Create an item, read it back, delete it, get a 204.” Those tests are written by the same people who wrote the code, so they test the inputs those people expected. Nobody writes the test that sends a 65-character name, a quantity of 2^64, or a DELETE for an item that was never created, because nobody thought of it. ...

October 23, 2026 · 33 min · Scott Algatt