Individual skill
api-fuzzing-restler
Stateful REST API fuzzing with RESTler — compiling an OpenAPI spec into a fuzzing grammar, running test/fuzz-lean/fuzz modes with custom dictionaries, destructive sequences, bug-bucket triage, and coverage verification
internal/tools/skills/data/api-security/api-fuzzing-restler/SKILL.md
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- cybersecurity Repository topic
- security Repository topic
- bug-bounty Repository topic
- automation Repository topic
- autonomous-pentesting Repository topic
- ai-agent Repository topic
- ai-security Repository topic
- ethical-hacking Repository topic
- golang Repository topic
- penetration-testing Repository topic
- testing Derived category
- docs Derived category
- docs-api Derived category
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# API Fuzzing with RESTler
## Purpose
Run Microsoft RESTler for stateful, grammar-driven REST API fuzzing: producer-consumer request sequences that surface 500-class crashes, authentication bypasses, resource leaks, injection, and state-dependent bugs that single-request testing misses. Destructive sequences are part of the methodology and are governed by the runtime policy, not by this skill.
## Preconditions
- OpenAPI/Swagger spec (v2 or v3) for the target API
- RESTler installed (github.com/microsoft/restler-fuzzer) with Python 3.12+ and .NET 8
- Working auth (refresh command if tokens expire mid-run)
[Credential-related source omitted]
## Attack Surface Signals
- Any documented OpenAPI spec (from recon, swagger.json, v2/v3 api-docs)
- APIs with object dependencies: create → update → delete chains