The lmdb crate hasn't had any updates since August 2018.
Mozilla's lmdb-rkv fork of the crate has received additional maintenance work beyond that and is the best available replacement.
{ "license": "CC0-1.0" }
{ "affected_functions": null, "affects": { "os": [], "functions": [], "arch": [] } }
{ "cvss": null, "informational": "unmaintained", "categories": [] }