Bitcoin Core developers have introduced a "critical bug" disclosure policy to improve communication about Bitcoin security vulnerabilities. The team acknowledged that the perception of Bitcoin Core being bug-free is inaccurate and potentially harmful. The new policy will categorize vulnerabilities into four levels of severity: low, medium, high, and critical. The disclosure of low, medium, and high bugs will occur two weeks after a fixed version is released, while critical bugs will be handled case-by-case. The policy will be gradually implemented in the coming months.