diff --git a/fuzzing/pdf_surface_fuzzer.c b/fuzzing/pdf_surface_fuzzer.c
index c8ae6913a..aafc51c13 100644
--- a/fuzzing/pdf_surface_fuzzer.c
+++ b/fuzzing/pdf_surface_fuzzer.c
@@ -21,14 +21,19 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
         return 0;
     }
 
-    flags = CAIRO_PDF_OUTLINE_FLAG_BOLD | CAIRO_PDF_OUTLINE_FLAG_OPEN;
-    cairo_pdf_surface_set_page_label(surface, data);
-    cairo_pdf_surface_set_metadata(surface, CAIRO_PDF_METADATA_TITLE, data);
-    cairo_tag_begin(cr, data, NULL);
-    cairo_tag_end(cr, data);
+    char *buf = (char *) malloc(size + 1);
+    memcpy(buf, data, size);
+    buf[size] = '\0';
 
-    cairo_surface_destroy(surface);
+    flags = CAIRO_PDF_OUTLINE_FLAG_BOLD | CAIRO_PDF_OUTLINE_FLAG_OPEN;
+    cairo_pdf_surface_set_metadata(surface, CAIRO_PDF_METADATA_TITLE, buf);
+    cr = cairo_create(surface);
+    cairo_tag_begin(cr, buf, NULL);
+    cairo_tag_end(cr, buf);
+
+    free(buf);
     cairo_destroy(cr);
+    cairo_surface_destroy(surface);
     fuzzer_release_tmpfile(tmpfile);
     return 0;
 }
diff --git a/fuzzing/raster_fuzzer.c b/fuzzing/raster_fuzzer.c
index bd6bdaf54..87224c450 100644
--- a/fuzzing/raster_fuzzer.c
+++ b/fuzzing/raster_fuzzer.c
@@ -39,14 +39,20 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
     w = cairo_image_surface_get_width(surface);
     h = cairo_image_surface_get_height(surface);
 
-    pattern = cairo_pattern_create_raster_source(data, content, w, h);
+    char *buf = (char *) malloc(size + 1);
+    memcpy(buf, data, size);
+    buf[size] = '\0';
+
+    pattern = cairo_pattern_create_raster_source(buf, content, w, h);
     cairo_raster_source_pattern_set_acquire (pattern, acquire, release);
     cairo_set_source(cr, pattern);
+    cairo_pdf_surface_set_page_label(surface, buf);
     cairo_paint(cr);
 
     cairo_destroy(cr);
     cairo_pattern_destroy(pattern);
     cairo_surface_destroy(surface);
+    free(buf);
     fuzzer_release_tmpfile(tmpfile);
     return 0;
 }
diff --git a/fuzzing/text_glyphs_fuzzer.c b/fuzzing/text_glyphs_fuzzer.c
index 91a96dc7d..3661799df 100644
--- a/fuzzing/text_glyphs_fuzzer.c
+++ b/fuzzing/text_glyphs_fuzzer.c
@@ -25,8 +25,12 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
         return 0;
     }
 
+    char *buf = (char *) malloc(size + 1);
+    memcpy(buf, data, size);
+    buf[size] = '\0';
+
     cr = cairo_create(surface);
-    cairo_text_extents(cr, data, &extents);
+    cairo_text_extents(cr, buf, &extents);
     cluster.num_bytes = size;
     cluster.num_glyphs = 1;
     for (int i = 0; i < 9; i++) {
@@ -34,11 +38,12 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
         cairo_glyph_t glyph = {
             index[i], 10 * i, 25
         };
-        cairo_show_text_glyphs(cr, data, size, &glyph, 1, &cluster, 1, 0);
+        cairo_show_text_glyphs(cr, buf, size, &glyph, 1, &cluster, 1, 0);
     }
 
     cairo_destroy(cr);
     cairo_surface_destroy(surface);
+    free(buf);
     fuzzer_release_tmpfile(tmpfile);
     return 0;
 }