Quick answers
- Is CVE-2026-3861 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-3861 being exploited in the wild.
- How severe is CVE-2026-3861?
- Medium severity, with a CVSS score of 6.5, published 16 April 2026.
- Which products and versions are affected?
- LY Corporation LINE client for iOS versions prior to 26.3.0.
- Is there a fix for CVE-2026-3861?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-3861 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-3861?
- Check whether you run Linecorp Line. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A vulnerability exists in the in-app browser of the LINE iOS application due to insufficient safeguards when handling arbitrary URL schemes. By enticing a user to visit a specially crafted webpage, a remote attacker can trigger a loop of OS-level dialogs (CWE-451). This results in a denial-of-service condition where the device becomes temporarily inoperable due to the persistent UI interference. The issue is resolved in version 26.3.0.
Affected products
- LY Corporation LINE client for iOS versions prior to 26.3.0
Timeline
- 2026-04-16: disclosed
- 2026-04-16: advisory