digest: clear target buffer

Closes #10814

diff --git a/lib/vauth/digest.c b/lib/vauth/digest.c
index b7a0d92a316339fb2d97eb16188907208cfe9f8e..fda2d911f7b12034ab5b8ab33ad58f67fc7e5777 100644 (file)
--- a/lib/vauth/digest.c
+++ b/lib/vauth/digest.c
@@ -694,6 +694,7 @@ static CURLcode auth_create_digest_http_message(
   char *hashthis = NULL;
   char *tmp = NULL;
 
+  memset(hashbuf, 0, sizeof(hashbuf));
   if(!digest->nc)
     digest->nc = 1;