CVE-2021-45680: Out-of-bounds Write in vec-const

The vulnerability stems from improperly constructing a Vec from a const slice pointer. The advisory explicitly states the crate tried to create a Vec with nonzero capacity in const context, which is impossible as Vec requires heap allocation. The function responsible for this unsafe construction (likely from_raw_parts or similar) would be vulnerable. The high confidence comes from the advisory's technical description matching the pattern of unsafe Vec construction from raw pointers without proper allocator integration.