diff --git a/docs/changelog.rst b/docs/changelog.rst
index 87ce49374..a98152d78 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -170,6 +170,8 @@ Detailed list of changes
 
 - Fix thickness of diagonal lines in box drawing characters not the same as horizontal/vertical lines (:iss:`9719`)
 
+- Graphics protocol: Fix crash when handling invalid PNG image with direct transmission
+
 0.46.2 [2026-03-21]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/kitty/graphics.c b/kitty/graphics.c
index 3cfec4ba3..944c21dab 100644
--- a/kitty/graphics.c
+++ b/kitty/graphics.c
@@ -555,7 +555,7 @@ load_image_data(GraphicsManager *self, Image *img, const GraphicsCommand *g, con
         case 'd':  // direct
             if (load_data->buf_capacity - load_data->buf_used < g->payload_sz) {
                 if (load_data->buf_used + g->payload_sz > MAX_DATA_SZ || data_fmt != PNG) ABRT("EFBIG", "Too much data");
-                load_data->buf_capacity = MIN(2 * load_data->buf_capacity, MAX_DATA_SZ);
+                load_data->buf_capacity = MAX(MIN(2 * load_data->buf_capacity, MAX_DATA_SZ), load_data->buf_used + g->payload_sz);
                 load_data->buf = realloc(load_data->buf, load_data->buf_capacity);
                 if (load_data->buf == NULL) {
                     load_data->buf_capacity = 0; load_data->buf_used = 0;