CVE-2026-2766
CRITICAL
2026-02-24
[email protected]
9.8
CVSS 3.1
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CVSS Vector
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
Description
Use-after-free in the JavaScript Engine: JIT component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.
Analysis
Use-after-free in Firefox JavaScript JIT compiler before 148. Second JIT-related UAF in this release, different from CVE-2026-2764.
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Remediation
Within 24 hours: Inventory all Firefox and Thunderbird installations across the organization and identify business-critical users. Issue urgent advisory prohibiting use of affected versions for handling untrusted content. …
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Priority Score
49
Low
Medium
High
Critical
KEV: 0
EPSS: +0.1
CVSS: +49
POC: 0
Vendor Status
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External POC / Exploit Code
Leaving vuln.today
Destination URL
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