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Mozilla CVE-2026-2762

CRITICAL
Integer Overflow or Wraparound (CWE-190)
2026-02-24 security@mozilla.org
Buffer Overflow Integer Overflow Mozilla
9.8
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Patch released
Apr 10, 2026 - 08:30 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
CVE Published
Feb 24, 2026 - 14:16 nvd
CRITICAL 9.8

DescriptionNVD

Integer overflow in the JavaScript: Standard Library component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.

AnalysisAI

Integer overflow in Firefox JavaScript Standard Library before 148 leads to memory corruption through crafted JavaScript operations.

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RemediationAI

Within 24 hours: Issue an urgent security advisory to all users of Firefox and Thunderbird; document affected systems and user counts. Within 7 days: Implement network-based mitigations (disable JavaScript execution where possible, implement application whitelisting); consider disabling Thunderbird for high-risk users until patched. …

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CVE-2026-2762 vulnerability details – vuln.today
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