PatchTheCVECVE-2026-3861: LINE client for iOS versions prior to 26.3.0 contains a vulnerability in the in-app browser where opening a cr
CVE-2026-3861 is a medium-severity flaw (CVSS 6.5) affecting line. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.5 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.3% (top 77%) |
| CISA exploited list | No |
| Weakness | CWE-451 |
| Published | 2026-04-16 |
| Last modified | 2026-10-26 |
Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-3861?
line: upgrade to 26.3.0. Exact commands for each OS are on this page.
Is CVE-2026-3861 being exploited?
CVE-2026-3861 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-3861 affect?
CVE-2026-3861 affects line. Severity is medium (CVSS 6.5). 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, potenti
How urgent is CVE-2026-3861?
Priority 29/100. No elevated risk signals yet.