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18 Aug 2023 - Liblouis

Fuzzing or fuzz testing is an automated software testing technique that involves providing invalid, unexpected, or random data as inputs to a computer program. The program is then monitored for exceptions such as crashes, failing built-in code assertions, or potential memory leaks (see Wikipedia article on Fuzzing).

Automated fuzz tests have been set up for liblouis for a few years now and these tests have uncovered quite a few bugs, even security critical ones.

Earlier this year the Open Source Technology Improvement Fund (OSTIF) together with Adalogics, a well known consultancy for software security, have worked on some major improvements to the existing test coverage. The report on their work and their results can be found in blog posts from both OSTIF and ADALogic.

The work has already paid of, quite a steady stream of security related issues trickles in through the automated fuzzing. Now all that is left to do is to fix these issues.

Want to help with this? Contact us on the #liblouis channel at or the matrix channel at