Memory Safety Vulnerability in Firefox by Mozilla
CVE-2026-3847

8.8HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Vendor
CVE Published:
10 March 2026

What is CVE-2026-3847?

This vulnerability involves memory safety issues found in specific versions of Firefox, particularly in versions earlier than 148.0.2. These memory safety bugs indicate potential memory corruption, which, if exploited, could allow attackers to execute arbitrary code on affected systems. The risks associated with these flaws necessitate immediate attention for users operating on vulnerable Firefox versions to ensure their systems remain secure.

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Affected Version(s)

Firefox < 148.0.2

References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=2017513%2...
https://www.mozilla.org/security/advisories/mfsa2026-19/

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jon Coppeard and the Mozilla Fuzzing Team
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