CVE-2026-3861

Received Received - Intake

Denial of Service via Dialog Flood in LINE iOS Browser

Publication date: 2026-04-16

Last updated on: 2026-04-30

Assigner: LINE Corporation

Description

LINE client for iOS versions prior to 26.3.0 contains a vulnerability in the in-app browser where opening a crafted web page can repeatedly trigger OS-level dialogs due to insufficient safeguards when handling arbitrary URL schemes, potentially causing the iOS device to become temporarily inoperable.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-04-16

Last Modified

2026-04-30

Generated

2026-07-06

AI Q&A

2026-04-16

EPSS Evaluated

2026-07-05

NVD

CVE-2026-3861

EUVD

EUVD-2026-23196

Affected Vendors & Products

Vendor	Product	Version / Range
linecorp	line_client	to 26.3.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-451	The user interface (UI) does not properly represent critical information to the user, allowing the information - or its source - to be obscured or spoofed. This is often a component in phishing attacks.

Attack-Flow Graph

Executive Summary

The vulnerability exists in the LINE client for iOS versions prior to 26.3.0, specifically in its in-app browser. When a user opens a specially crafted web page, it can repeatedly trigger operating system level dialogs. This repeated triggering can cause the iOS device to become temporarily inoperable.

Impact Analysis

This vulnerability can impact you by causing your iOS device to become temporarily unusable. Since the crafted web page can repeatedly trigger OS-level dialogs, it may disrupt normal device operation and prevent you from using your device until the issue resolves.

Mitigation Strategies

To mitigate this vulnerability, update the LINE client for iOS to version 26.3.0 or later, as versions prior to 26.3.0 contain the vulnerability.

Avoid opening untrusted or crafted web pages within the in-app browser until the update is applied.

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