From af277fe06f5cc5f9bbdb0d2147da233394e212e2 Mon Sep 17 00:00:00 2001
From: Tyler Yankee <tyler.yankee@kitware.com>
Date: Sun, 6 Sep 2026 10:02:18 -0400
Subject: [PATCH] presets: Avoid string conversion on bad "name" type

---
 Source/cmCMakePresetsErrors.cxx             |  5 ++++-
 Tests/Fuzzing/corpus/presets/name-list.json | 11 +++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 Tests/Fuzzing/corpus/presets/name-list.json

diff --git a/Source/cmCMakePresetsErrors.cxx b/Source/cmCMakePresetsErrors.cxx
index 5679eeaa44..db80ecb901 100644
--- a/Source/cmCMakePresetsErrors.cxx
+++ b/Source/cmCMakePresetsErrors.cxx
@@ -42,7 +42,10 @@ std::string getPresetName(cmJSONState* state)
 {
   Json::Value const* preset = getPreset(state);
   if (preset && preset->isMember("name")) {
-    return preset->operator[]("name").asString();
+    Json::Value const& name = preset->operator[]("name");
+    if (name.isConvertibleTo(Json::ValueType::stringValue)) {
+      return name.asString();
+    }
   }
   return "";
 }
diff --git a/Tests/Fuzzing/corpus/presets/name-list.json b/Tests/Fuzzing/corpus/presets/name-list.json
new file mode 100644
index 0000000000..7540772874
--- /dev/null
+++ b/Tests/Fuzzing/corpus/presets/name-list.json
@@ -0,0 +1,11 @@
+{
+    "version":6,
+    "configurePresets": [
+        {
+            "name": [],
+            "cacheVariables": {
+                "": {}
+            }
+        }
+    ]
+}