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CVE-2026-100791— Use-after-free in the DOM: Core & HTML 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.

DOM: Core & HTML 组件中存在一个释放后使用（Use-after-free）漏洞。该漏洞已在 Firefox ESR 153.4、Firefox 157、Firefox ESR 115.42 和 Firefox ESR 140.17 中修复。

AI Predicted 8.8 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 4

VendorProduct Version RangeStatus
Mozilla Firefox 115.42≤ 115.* unaffected
140.17≤ 140.* unaffected
153.4≤ 153.* unaffected
157≤ * unaffected
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I. Basic Information for CVE-2026-100791

Vulnerability Information
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Vulnerability Title
Use-after-free in the DOM: Core & HTML component
Source: CVE Program / CVE List V5
Vulnerability Description
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
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 115.42 ~ 115.* -
Mozilla Thunderbird 140.17 ~ 140.* -

II. Public POCs for CVE-2026-100791

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III. Intelligence Information for CVE-2026-100791

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Other References for CVE-2026-100791 (7)

Same Patch Batch · Mozilla · 2026-09-29 · 77 CVEs total

CVE-2026-100782 Privilege escalation due to incorrect boundary conditions in the Graphics component
CVE-2026-100763 Incorrect boundary conditions in the Graphics: WebGPU component
CVE-2026-100775 Sandbox escape in the Graphics component
CVE-2026-100776 Use-after-free in the JavaScript: WebAssembly component
CVE-2026-100777 Use-after-free in the Graphics: Canvas2D component
CVE-2026-100778 Sandbox escape due to use-after-free in the DOM: Core & HTML component
CVE-2026-100779 Use-after-free in the XSLT component
CVE-2026-100780 Use-after-free in the DOM: Core & HTML component
CVE-2026-100781 Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component
CVE-2026-100783 Uninitialized memory in the Audio/Video component
CVE-2026-100773 Use-after-free in the Storage: IndexedDB component
CVE-2026-100784 Use-after-free in the Layout: Text and Fonts component
CVE-2026-100785 Use-after-free in the DOM: Core & HTML component
CVE-2026-100786 Sandbox escape due to use-after-free in the Graphics component
CVE-2026-100787 Sandbox escape in the XUL component
CVE-2026-100788 Invalid pointer in the JavaScript: WebAssembly component
CVE-2026-100790 Use-after-free in the XSLT component
CVE-2026-100789 Use-after-free in the Graphics: Canvas2D component
CVE-2026-100792 JIT miscompilation in the JavaScript: WebAssembly component
CVE-2026-100793 JIT miscompilation in the JavaScript Engine component

Showing top 20 of 77 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-100791

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