A page in reference/ or guides/ that misstates contract behavior can send an integrator to production on a false assumption, which is the one security-relevant failure this repository can produce. Report it through private vulnerability reporting on this repository when the report should stay closed until the page is fixed, and through the fact-error issue form otherwise.
A vulnerability in a contract itself goes to the repository that carries the code, atomicassets/atomicassets-contract or atomicassets/atomicmarket-contract, rather than here. This repository holds documentation and sample code and runs no service, so it has nothing deployed to patch.