Report data race and memory safety issue in appendix

crates/appendix/RUSTSEC-0000-0000.md

@@ -0,0 +1,23 @@
+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "appendix"
+date = "2020-11-15"
+url = "https://github.com/krl/appendix/issues/6"
+categories = ["memory-corruption", "thread-safety"]
+
+[versions]
+patched = []
+```
+
+# Data race and memory safety issue in `Index`
+
+The `appendix` crate implements a key-value mapping data structure called
+`Index<K, V>` that is stored on disk. The crate allows for any type to inhabit
+the generic `K` and `V` type parameters and implements Send and Sync for them
+unconditionally.
+
+Using a type that is not marked as `Send` or `Sync` with `Index` can allow it
+to be used across multiple threads leading to data races. Additionally using
+reference types for the keys or values will lead to the segmentation faults
+in the crate's code.