Policy and Disclosure: 2025 Edition

Posted by Tim Willis, Google Project Zero In 2021, we updated our vulnerability disclosure policy to the current "90+30" model. Our goals were to drive faster yet thorough patch development, and improve patch adoption. While we’ve seen progress, a significant challenge remains: the time it takes...

On the Effectiveness of Mutational Grammar Fuzzing

Posted by Ivan Fratric Mutational grammar fuzzing is a fuzzing technique in which the fuzzer uses a predefined grammar that describes the structure of the samples. When a sample gets mutated, the mutations happen in such a way that any resulting samples still adhere to the grammar rules, thus the...

Pointer leaks through pointer-keyed data structures

Posted by Jann Horn, Google Project Zero Introduction Some time in 2024, during a Project Zero team discussion, we were talking about how remote ASLR leaks would be helpful or necessary for exploiting some types of memory corruption bugs, specifically in the context of Apple devices. Coming from...