Add unsound advisory for scaly

crates/scaly/RUSTSEC-0000-0000.md

@@ -0,0 +1,23 @@
+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "scaly"
+date = "2026-01-19"
+url = "https://github.com/rustsec/advisory-db/issues/2594"
+informational = "unsound"
+
+[versions]
+patched = []
+```
+
+# Multiple soundness issues in `scaly` safe APIs
+
+Affected versions contain multiple safe APIs that can trigger undefined
+behavior:
+
+- `Array<T>::index` can perform an out-of-bounds read.
+- `String::get_length` can perform an out-of-bounds read.
+- `String::append_character` can perform an invalid write.
+- `String::to_c_string` can perform an out-of-bounds write.
+
+These issues were reproduced against `scaly` 0.0.37 under Miri. And the crate is unmaintained.