--- dovecot-2.4.3/src/plugins/fts-flatcurve/fts-backend-flatcurve-xapian.cc	2026-03-25 13:35:43.000000000 +0100
+++ dovecot-2.4.3/src/plugins/fts-flatcurve/fts-backend-flatcurve-xapian.cc.orig	2026-03-31 18:35:33.279717982 +0200
@@ -1046,6 +1046,9 @@
 	bool valid = FALSE;
 	do {
 		errno = 0;
+		size_t len = 0;
+		char   *filename = NULL;
+		struct stat t_statbuf = {};
 		struct dirent *entry = readdir(dir);
 		if (errno != 0) {
 			*error_r = t_strdup_printf("readdir(%s) failed: %m", path);
@@ -1057,9 +1060,18 @@
 		if (entry == NULL)
 			break;
 
-		valid = (entry->d_type & DT_DIR) != 0 &&
+		len = strlen(path) + strlen(entry->d_name) + 2;
+               if ((filename = (char *) malloc(sizeof (char) * len)) == NULL) {
+		    i_error("No memory available for filename string (%s): %m", filename);
+                   exit(ENOMEM);
+               }
+               snprintf(filename, len, "%s/%s", path, entry->d_name);
+               errno = 0;
+               if (lstat(filename, &t_statbuf) == 0) {
+		    valid = S_ISDIR(t_statbuf.st_mode) &&
 			(str_begins_with(entry->d_name, FLATCURVE_XAPIAN_DB_CURRENT_PREFIX) ||
 			 str_begins_with(entry->d_name, FLATCURVE_XAPIAN_DB_PREFIX));
+               }
 	}
 	while (!valid);