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CVE-2026-92021— Use-after-free in the JavaScript Engine: JIT component

Quick assessment

Affected
Mozilla Firefox
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

JavaScript 引擎中的“使用已释放内存”（Use-after-free）漏洞，位于 JIT 组件。该漏洞已在 Firefox ESR 140.16 中修复。

AI Predicted 7.6 Difficulty: Hard EPSS 0.30% · P23

Affected Version Matrix 2

VendorProduct Version RangeStatus
Mozilla Firefox 140.16≤ * unaffected
Mozilla Thunderbird 140.16≤ * unaffected
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I. Basic Information for CVE-2026-92021

Vulnerability Information
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Vulnerability Title
Use-after-free in the JavaScript Engine: JIT component
Source: CVE Program / CVE List V5
Vulnerability Description
Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox ESR 140.16 and Thunderbird 140.16.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mozilla Firefox 140.16 ~ * -
Mozilla Thunderbird 140.16 ~ * -

II. Public POCs for CVE-2026-92021

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III. Intelligence Information for CVE-2026-92021

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Vendor Advisories for CVE-2026-92021 (2)

Same Patch Batch · Mozilla · 2026-09-15 · 78 CVEs total

CVE-2026-92039 Mitigation bypass in the DOM: Notifications component
CVE-2026-92038 Mitigation bypass in the Remote Settings Client component
CVE-2026-92024 Use-after-free in the SVG component
CVE-2026-92036 Incorrect boundary conditions in the Networking: HTTP component
CVE-2026-92035 Sandbox escape due to incorrect boundary conditions in the Graphics component
CVE-2026-92037 Incorrect boundary conditions in the DOM: Animation component
CVE-2026-92040 Use-after-free in the JavaScript: WebAssembly component
CVE-2026-92041 Mitigation bypass in the DOM: Networking component
CVE-2026-92042 Race condition in the DOM: Content Processes component
CVE-2026-92043 Privilege escalation due to incorrect boundary conditions in the Audio/Video component
CVE-2026-92034 Site isolation issue in the Graphics component
CVE-2026-92033 Privilege escalation in Firefox for Android
CVE-2026-92032 Sandbox escape due to invalid pointer in the Graphics component
CVE-2026-92031 Information disclosure in the Graphics: ImageLib component
CVE-2026-92030 Mitigation bypass in the DOM: Copy & Paste and Drag & Drop component
CVE-2026-92029 Use-after-free in the SVG component
CVE-2026-92028 Use-after-free in the DOM: Core & HTML component
CVE-2026-92027 Use-after-free in the DOM: Streams component
CVE-2026-92026 Use-after-free in the Networking component
CVE-2026-92025 Use-after-free in the DOM: Navigation component

Showing top 20 of 78 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-92021

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