---
id: CVE-2026-3861
title: >-
  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, pote…
summary: >-
  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, pote…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cwe:
  - CWE-451
vendor: linecorp
product: line
affected:
  - line < 26.3.0
patched:
  - line 26.3.0
published: '2026-04-16'
updated: '2026-07-08'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-3861'
references:
  - url: 'https://hackerone.com/reports/3422905'
    label: dl_cve@linecorp.com
tags:
  - nvd
epss: 0.00345
epssPercentile: 0.25365
ingestedAt: '2026-07-08T03:46:38.647Z'
---

## Overview

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.

## Affected

- `line < 26.3.0`

## Remediation

Upgrade past the affected range:

- `line 26.3.0`