CVE-2026-3861: Linecorp Line

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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 products

• Linecorp Line: before 26.3.0 (fixed in 26.3.0)

Published 2026-04-16. Last modified 2026-07-08.