CVE-2026-3861

Repeated OS Dialog Trigger Causing Temporary iOS Device Inoperability via LINE In‑App Browser

Published Apr 16, 2026 CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
References
History
Type Values Removed Values Added
Title Repeated OS Dialog Trigger Causing Temporary iOS Device Inoperability via LINE In‑App Browser
Type Values Removed Values Added
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, potentially causing the iOS device to become temporarily inoperable. 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.
Metrics cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L'}

Type Values Removed Values Added
Title iOS Device Denial of Service via Repeated OS Dialogs in LINE In‑App Browser
Weaknesses CWE-835
Type Values Removed Values Added
Weaknesses CWE-451
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Line Corporation
Line Corporation line Client For Ios
Vendors & Products Line Corporation
Line Corporation line Client For Ios
Type Values Removed Values Added
Title iOS Device Denial of Service via Repeated OS Dialogs in LINE In‑App Browser
Weaknesses CWE-835
Type Values Removed Values Added
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, potentially causing the iOS device to become temporarily inoperable.
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
LY-Corporation
Published
Updated
May 22, 2026, 5:00 AM
Reserved
Mar 10, 2026, 5:02 AM
Status
Analyzed
Published
Apr 16, 2026, 7:16 AM
Modified
Oct 26, 2026, 9:10 PM