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CVE-2026-109733— JIT miscompilation 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 JIT 编译错误（JIT miscompilation）：该漏洞位于 JIT 组件。此问题已在 Firefox 158、Firefox ESR 115.43 以及 Firefox ESR 153.5 版本中得到修复。

AI Predicted 8.8 Difficulty: Moderate

Affected Version Matrix 5

VendorProduct Version RangeStatus
Mozilla Firefox 115.43≤ 115.* unaffected
153.5≤ 153.* unaffected
158≤ * unaffected
Mozilla Thunderbird 153.5≤ 153.* unaffected
158≤ * unaffected
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I. Basic Information for CVE-2026-109733

Vulnerability Information
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Vulnerability Title
JIT miscompilation in the JavaScript Engine: JIT component
Source: CVE Program / CVE List V5
Vulnerability Description
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
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 115.43 ~ 115.* -
Mozilla Thunderbird 153.5 ~ 153.* -

II. Public POCs for CVE-2026-109733

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III. Intelligence Information for CVE-2026-109733

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Other References for CVE-2026-109733 (5)

Same Patch Batch · Mozilla · 2026-10-13 · 83 CVEs total

CVE-2026-109736 Frame poisoning in the Layout component
CVE-2026-109749 Use-after-free in the JavaScript: WebAssembly component
CVE-2026-109715 Incorrect boundary conditions in the JavaScript Engine component
CVE-2026-109706 Use-after-free in the Storage: IndexedDB component
CVE-2026-109728 Use-after-free in the DOM: Animation component
CVE-2026-109714 Incorrect boundary conditions in the Layout component
CVE-2026-109707 Sandbox escape due to use-after-free in the Networking component
CVE-2026-109720 JIT miscompilation in the JavaScript: WebAssembly component
CVE-2026-109776 Race condition in the XPCOM component
CVE-2026-109730 Integer overflow in the Graphics component
CVE-2026-109731 Incorrect boundary conditions in the Graphics: Canvas2D component
CVE-2026-109726 Use-after-free in the SVG component
CVE-2026-109748 Use-after-free in the JavaScript: WebAssembly component
CVE-2026-109705 Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free
CVE-2026-109763 Mitigation bypass in the File Handling component
CVE-2026-109767 Information disclosure in the Networking component
CVE-2026-109751 Information disclosure in the Networking component
CVE-2026-109743 Privilege escalation in the Panning and Zooming component
CVE-2026-109732 Use-after-free in the DOM: Streams component
CVE-2026-109713 Use-after-free in the Crash Reporting component

Showing top 20 of 83 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-109733

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