lru: add advisory for Stacked Borrows violation

Author: paolobarbolini

crates/lru/RUSTSEC-0000-0000.md

@@ -0,0 +1,24 @@
+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "lru"
+date = "2026-01-07"
+url = "https://github.com/jeromefroe/lru-rs/pull/224"
+informational = "unsound"
+categories = ["memory-corruption"]
+keywords = ["stacked-borrows"]
+
+[versions]
+patched = [">= 0.16.3"]
+unaffected = ["< 0.9.0"]
+```
+
+# `IterMut` violates Stacked Borrows by invalidating internal pointer
+
+Affected versions of this crate contain a soundness issue in the `IterMut`
+iterator implementation. The `IterMut::next` and `IterMut::next_back`
+methods temporarily create an exclusive reference to the key when
+dereferencing the internal node pointer.
+
+This invalidates the shared pointer held by the internal `HashMap`,
+violating Stacked Borrows rules.