{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "memory-corruption"
        ],
        "cvss": null,
        "informational": "unsound"
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "lru",
        "purl": "pkg:cargo/lru"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "0.18.2"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "`LruCache::pop()` in `lru` was not panic-safe. If the `Drop` implementation of a stored key panics during `pop()`, `self.detach()` is never called, leaving dangling pointers in the internal doubly-linked list.\n\nA subsequent cache operation that triggers eviction can then dereference these dangling pointers:\n- The node is freed from the map, but remains linked in the LRU list due to the skipped `detach()` call\n- When a new insertion causes eviction, the LRU traversal encounters the dangling pointer\n- This results in a write to already-freed memory during the eviction process\n\n## Impact\n\n- **CWE-416 (Use-After-Free):** memory corruption when subsequent cache operations access freed node pointers in the linked list\n- **CWE-415 (Double Free):** potential heap corruption when the same memory is freed multiple times\n\nBoth types of undefined behavior can be invoked in safe Rust, but only if unwinding panics are enabled and `std::panic::catch_unwind` is used with key types that have potentially-panicking `Drop` implementations.\n\n## Fix\n\nFixed in `lru` 0.18.2 by detaching the node from the linked list before freeing it and dropping the key ([lru-rs#238](https://github.com/jeromefroe/lru-rs/pull/238)).",
  "id": "RUSTSEC-2026-0253",
  "modified": "2026-08-11T11:04:49Z",
  "published": "2026-05-12T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/lru"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0253.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jeromefroe/lru-rs/pull/238"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "Potential use-after-free due to lack of panic safety in `LruCache::pop()`"
}