CVE-2026-2765
Received Received - Intake
Use-After-Free in Firefox JavaScript Engine Enables Exploitation

Publication date: 2026-02-24

Last updated on: 2026-04-13

Assigner: Mozilla Corporation

Description
Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2026-02-24
Last Modified
2026-04-13
Generated
2026-06-16
AI Q&A
2026-02-24
EPSS Evaluated
2026-06-14
NVD
CVE-2026-2765
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox to 148.0 (exc)
mozilla thunderbird to 148.0 (exc)
mozilla thunderbird to 140.8.0 (exc)
mozilla firefox to 140.8.0 (exc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Mitigation Strategies

I don't know

Executive Summary

This vulnerability is a use-after-free issue in the JavaScript Engine component of Firefox. It affects versions of Firefox earlier than 148 and Firefox ESR earlier than 140.8. A use-after-free vulnerability occurs when a program continues to use memory after it has been freed, which can lead to unexpected behavior or exploitation.

Impact Analysis

Exploitation of this use-after-free vulnerability could allow an attacker to execute arbitrary code or cause a crash in the affected Firefox browser versions. This can compromise the security and stability of the browser, potentially leading to unauthorized actions or data exposure.

Compliance Impact

I don't know

Detection Guidance

I don't know

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-2765. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart