diff --git a/Misc/NEWS.d/next/Library/2026-04-16-13-30-00.gh-issue-148651.ZsTdLk.rst b/Misc/NEWS.d/next/Library/2026-04-16-13-30-00.gh-issue-148651.ZsTdLk.rst
new file mode 100644
index 00000000000000..b69f94a17663dc
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-04-16-13-30-00.gh-issue-148651.ZsTdLk.rst
@@ -0,0 +1,2 @@
+Fix reference leak in :class:`compression.zstd.ZstdDecompressor` when an
+invalid option key is passed.
diff --git a/Modules/_zstd/decompressor.c b/Modules/_zstd/decompressor.c
index 0186ee92f5b147..46682b483ad06a 100644
--- a/Modules/_zstd/decompressor.c
+++ b/Modules/_zstd/decompressor.c
@@ -111,6 +111,7 @@ _zstd_set_d_parameters(ZstdDecompressor *self, PyObject *options)
         int key_v = PyLong_AsInt(key);
         Py_DECREF(key);
         if (key_v == -1 && PyErr_Occurred()) {
+            Py_DECREF(value);
             return -1;
         }