libformatstr.py vs XXEinjector: 2026 Comparison
libformatstr.py is a free penetration testing tool. XXEinjector is a free penetration testing tool. Compare features, ratings, integrations, and community reviews side by side to find the best penetration testing fit for your security stack.
CST VerdictBased on our analysis of available product data, here is our conclusion:
Penetration testers who regularly target legacy C applications will move faster with libformatstr.py because its automated parameter detection eliminates the manual trial-and-error that makes format string exploitation tedious. The library's 347 GitHub stars and active use in professional engagements confirm it handles real payloads, not toy examples. Skip this if your work centers on modern memory-safe languages or you need something with a GUI; libformatstr.py is Python-first and assumes comfort reading code.
Penetration testers who need to quickly validate XXE vulnerabilities across large application portfolios will find XXEinjector faster than manual exploitation; the tool automates payload generation and response parsing, cutting assessment time on each target by half compared to hand-crafted requests. With 1,667 GitHub stars and active use in professional engagements, it's proven reliable for identifying blind XXE and out-of-band exfiltration paths that manual testing often misses. Skip this if you need a full-stack web application testing platform; XXEinjector is deliberately narrow, doing one attack class extremely well rather than bundling generic vulnerability scanning.
