CVE-2026-3861

Q: How do I fix CVE-2026-3861?

Upgrade line to 26.3.0 or later.

Q: Is CVE-2026-3861 being actively exploited?

Not that we know of. CVE-2026-3861 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.30% is the estimated probability that it will be exploited in the next 30 days. That is higher than 23% of all scored CVEs.

Q: How severe is CVE-2026-3861?

CVE-2026-3861 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-3861 affect?

Published advisories record a fix for line (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

MEDIUM

6.5

CVSS v3

NVD

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.

CWE-451

How to fix

Remediation Available

lineNVD

Affected:< 26.3.0Fixed in:26.3.0CVE-2026-3861derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Exploit Intelligence

0.30%probability of exploitation in 30 days

23rdpercentile

Low risk: more likely to be exploited than 23% of all known CVEs.

References

Other references1

hackerone.com

Related Vulnerabilities

Other CWE-451 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-38112	High	7.5	84%	KEV	Fix
CVE-2025-9491	High	7.8	69%	-	-
CVE-2024-43461	High	8.8	52%	KEV	Fix
CVE-2024-38197	Medium	6.5	16%	-	-
CVE-2024-49040	High	7.5	7.7%	-	Fix
CVE-2026-0907	Critical	9.8	7.7%	-	Fix

Common questions

How do I fix CVE-2026-3861?

Upgrade line to 26.3.0 or later.

Is CVE-2026-3861 being actively exploited?

Not that we know of. CVE-2026-3861 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.30% is the estimated probability that it will be exploited in the next 30 days. That is higher than 23% of all scored CVEs.

How severe is CVE-2026-3861?

CVE-2026-3861 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-3861 affect?

Published advisories record a fix for line (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-3861

Markdown

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-08.