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lru: add advisory for Stacked Borrows violation #2576

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djc merged 1 commit into from
Jan 7, 2026
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lru: add advisory for Stacked Borrows violation #2576

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24 changes: 24 additions & 0 deletions crates/lru/RUSTSEC-0000-0000.md
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```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.