Mozilla Firefox Denial of Service Vulnerability

Release Date: 9 Sep 2026

A vulnerability was identified in Mozilla Firefox. A remote attacker could exploit some of these vulnerabilities to trigger denial of service condition on the targeted system.

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Impact

• Denial of Service

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System / Technologies affected

Versions prior to:

 

• Firefox for iOS 155.1

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Solutions

Before installation of the software, please visit the vendor web-site for more details.

Apply fixes issued by the vendor:

 

• Firefox for iOS 155.1

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Vulnerability Identifier

• CVE-2026-86853

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Source

• Mozilla

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Related Link

• https://www.mozilla.org/en-US/security/advisories/mfsa2026-89/