PDF links in WKWebView not clickable on iOS 26 (working on pre-iOS 26)

Hello Apple Developer Community,

I'm experiencing an issue with PDF link interaction in WKWebView that appears to be specific to iOS 26.

Problem Description:

I'm loading a PDF in WKWebView from: https://www.kawashin.co.jp/etc/pdf/kitei_app.pdf.The links may vary widely and are not necessarily DPF, so I need to load them using WKWebView. On iOS versions prior to 26, links within the PDF (e.g., the "https://www.onespan.com/privacy-center" link on page 12) are clickable and work correctly. On iOS 26, the same links are not clickable (no response when tapped). Expected Behavior:

PDF links should remain clickable and functional across all iOS versions.

What I've Tried:

Tested opening the PDF directly in Safari on iOS 26 - links still not clickable This suggests the issue might be related to changes in the system's PDF rendering engine Reproduction Steps:

Load the PDF URL in WKWebView Navigate to page 12 Attempt to tap the "https://www.onespan.com/privacy-center" link Environment:

Test Devices: iPhone 15(26.0 ) / iPhone 16 Pro Max(18.0.1 ) Xcode: 16.2

Attachments:

//
//  ViewController.swift
//  PDFLinkDemo
//
//  Created by liusy on 2025/10/29.
//


import UIKit
import WebKit


class ViewController: UIViewController {


    @IBOutlet weak var webview: WKWebView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        if let url = URL(string: "https://www.kawashin.co.jp/etc/pdf/kitei_app.pdf") {
            webview.load(URLRequest(url: url))
        }
    }
}

Questions:

Is this an intentional change in iOS 26's PDF handling or WKWebView? If so, is there a new API or configuration to restore link interactivity?

Any guidance or suggestions would be greatly appreciated!