diff --git a/EXAMPLE_ADVISORY.md b/EXAMPLE_ADVISORY.md
index d3b71db45..61229d208 100644
--- a/EXAMPLE_ADVISORY.md
+++ b/EXAMPLE_ADVISORY.md
@@ -6,8 +6,11 @@ date = "2020-01-31"
 url = "https://example.com"
 # Valid categories: "code-execution", "crypto-failure", "denial-of-service", "file-disclosure"
 # "format-injection", "memory-corruption", "memory-exposure", "privilege-escalation"
+# They are described at https://github.com/rustsec/rustsec/blob/main/rustsec/src/advisory/category.rs
 categories = ["code-execution", "privilege-escalation"]
 keywords = ["example", "freeform", "keywords"]
+# Valid informational: notice, unmaintained, unsound
+informational = "unsound"
 #aliases = ["CVE-YYYY-NNNN"]
 #cvss = "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"
 
diff --git a/crates/lockfree/RUSTSEC-0000-0000.md b/crates/lockfree/RUSTSEC-0000-0000.md
new file mode 100644
index 000000000..68d1b2f46
--- /dev/null
+++ b/crates/lockfree/RUSTSEC-0000-0000.md
@@ -0,0 +1,25 @@
+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "lockfree"
+date = "2025-11-17"
+url = "https://gitlab.com/bzim/lockfree/-/issues/4"
+categories = ["memory-corruption"]
+keywords = ["memory-safety", "std::mem::uninitialized"]
+informational = "unsound"
+
+[versions]
+patched = []
+unaffected = ["<= 0.4.0"]
+```
+
+# lockfree crate is unsound and unmaintained
+
+Affected versions of this crate called `mem::uninitialized()` to construct `Removable<T>`.
+This is unsound.
+
+In addition, the `lockfree` crate is no longer actively maintained.  If you rely on this crate, consider switching to a recommended alternative.
+
+## Recommended alternatives
+
+- [`lock_freedom`](https://crates.io/crates/lock_freedom)
\ No newline at end of file