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Report unsoundness for lmdb-rs #2539

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25 changes: 25 additions & 0 deletions crates/lmdb-rs/RUSTSEC-0000-0000.md
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```toml
[advisory]
id = "RUSTSEC-0000-0000"
package = "lmdb-rs"
date = "2025-12-22"
informational = "unsound"
url = "https://github.com/vhbit/lmdb-rs/issues/69"
keywords = ["unsound"]
references = ["https://github.com/vhbit/lmdb-rs/issues/67"]

[affected.functions]
"lmdb_rs::FromMdbValue::from_mdb_value" = [">= 0.0.0"]

[versions]
patched = []
```

# Undefined Behavior by Safe Function `from_mdb_value`

The implementation of `FromMdbValue` for `Vec<u8>` calls `slice::from_raw_parts` without validating the pointer or length.
This allows creating a slice from an invalid pointer (e.g. dangling or null), leading to Undefined Behavior even when called from safe code.

The issue was reported in [issue #69](https://github.com/vhbit/lmdb-rs/issues/69) with a PoC demonstrating UB using `miri`.

This vulnerability affects the same function `from_mdb_value` that was previously reported and had a proposed fix in [issue #67](https://github.com/vhbit/lmdb-rs/issues/67). However, the previous attempts did not fully satisfy safety requirements, indicating a necessity for a more systematic patch.