From 30b20e07e787ba08f12a63bb5af26a3c72b5f3ee Mon Sep 17 00:00:00 2001
From: Kim Kulling <kim.kulling@googlemail.com>
Date: Tue, 23 Sep 2025 21:28:54 +0200
Subject: [PATCH] Fix possible overflow

---
 code/AssetLib/3MF/XmlSerializer.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/code/AssetLib/3MF/XmlSerializer.cpp b/code/AssetLib/3MF/XmlSerializer.cpp
index 75dda4bf5..8ddbce801 100644
--- a/code/AssetLib/3MF/XmlSerializer.cpp
+++ b/code/AssetLib/3MF/XmlSerializer.cpp
@@ -524,6 +524,9 @@ void XmlSerializer::ImportTriangles(XmlNode &node, aiMesh *mesh) {
                         auto update_color = [&](int idx) {
                             if (pindex[idx] != IdNotSet) {
                                 size_t vertex_index = face.mIndices[idx];
+                                if (vertex_index >= mesh->mNumVertices) {
+                                    return;
+                                }
                                 mesh->mColors[0][vertex_index] = group->mColors[pindex[idx]];
                             }
                         };