diff -up rpm-4.16.1.3/lib/rpmts.c.orig rpm-4.16.1.3/lib/rpmts.c
--- rpm-4.16.1.3/lib/rpmts.c.orig	2024-07-11 13:55:35.430198126 +0200
+++ rpm-4.16.1.3/lib/rpmts.c	2024-07-11 13:55:59.243061182 +0200
@@ -482,6 +482,8 @@ static int makePubkeyHeader(rpmts ts, rp
     int rc = -1;
     int i;
 
+    memset(&kd, 0, sizeof(kd));
+
     if ((enc = rpmPubkeyBase64(key)) == NULL)
 	goto exit;
     if ((dig = rpmPubkeyDig(key)) == NULL)