casefold-fuzz
casefold-fuzz is a lightweight Python library that generates multiple evasion variants from a single prompt injection string. It produces casefold, confusable, invisible-character, leetspeak, and spacing mutations to help developers stress-test their LLM guardrails and security filters. Distributed as a pure-stdlib package under Apache-2.0, it is ideal for security researchers and AI application developers building robust defenses against prompt attacks.
Open SourceApache-2.0CLI
Overview
5 featuresIn the LLM eval & observability space, casefold-fuzz takes a focused approach. It focuses on testing LLM guardrails against prompt injection, homoglyph, and evasion attacks by generating mutation variants. casefold-fuzz is an open-source project aimed at developers. casefold-fuzz is open source under the Apache-2.0 license. casefold-fuzz is available on the command line.
Fevzi Ege Yurtsevenler builds and maintains casefold-fuzz, and it first shipped in 2026. Development happens publicly on GitHub with 3 commits in the last 90 days. Key capabilities include Prompt Injection Fuzzing, Homoglyph Generation, and Leetspeak Variants.
Summary written by a language model from the project’s public pages.
- Prompt Injection Fuzzing
- Homoglyph Generation
- Leetspeak Variants
- Zero-Width Characters
- Unicode Confusables
Tags
prompt-injectionhomoglyph-fuzzerjailbreak-testingllm-securityunicode-evasion
AI capabilities
Text
Built with & integrations
Runs on
CLI
Trust & compliance
License
Apache-2.0
Verified signals
Indexing history
1What PulseGate has recorded for this listing
Frequently asked questions about casefold-fuzz
- What is casefold-fuzz?
- Casefold-fuzz focuses on testing LLM guardrails against prompt injection, homoglyph, and evasion attacks by generating mutation variants. It is catalogued under LLM eval & observability on PulseGate.
- Who should use casefold-fuzz?
- casefold-fuzz is an open-source project built for developers.
- Does casefold-fuzz have a free plan?
- Yes — casefold-fuzz is open source under the Apache-2.0 license and free to use.
- What platforms does casefold-fuzz run on?
- casefold-fuzz runs on the command line.
- Is casefold-fuzz still active?
- The GitHub repository shows 3 commits in the last 90 days.
- What projects are similar to casefold-fuzz?
- Similar projects tracked by PulseGate include ase-python, constraintloop, and OpenCode Data.ase-pythonconstraintloopOpenCode Data
- Who makes casefold-fuzz?
- casefold-fuzz is developed by Fevzi Ege Yurtsevenler.
- How long has casefold-fuzz been around?
- casefold-fuzz first shipped in 2026.
Also in LLM eval & observability
Same category — not a similarity match