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CVE-2026-0884— Use-after-free in the JavaScript Engine 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.

Mozilla Firefox和Mozilla Firefox ESR都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Firefox ESR是Firefox(Web浏览器)的一个延长支持版本。 Mozilla Firefox 147之前版本和Mozilla Firefox ESR 140.7之前版本存在安全漏洞，该漏洞源于JavaScript Engine组件存在释放后重用。

AI Predicted 8.8 Difficulty: Moderate EPSS 0.43% · P36
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I. Basic Information for CVE-2026-0884

Vulnerability Information
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Vulnerability Title
Use-after-free in the JavaScript Engine component
Source: CVE Program / CVE List V5
Vulnerability Description
Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.
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
Vulnerability Title
Mozilla Firefox和Mozilla Firefox ESR 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox和Mozilla Firefox ESR都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Firefox ESR是Firefox(Web浏览器)的一个延长支持版本。 Mozilla Firefox 147之前版本和Mozilla Firefox ESR 140.7之前版本存在安全漏洞，该漏洞源于JavaScript Engine组件存在释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mozilla Firefox 140.7 ~ 140.* -
Mozilla Thunderbird 140.7 ~ 140.* -

II. Public POCs for CVE-2026-0884

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III. Intelligence Information for CVE-2026-0884

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Vendor Advisories for CVE-2026-0884 (4)

Same Patch Batch · Mozilla · 2026-01-13 · 16 CVEs total

CVE-2026-0877 Mitigation bypass in the DOM: Security component
CVE-2026-0878 Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component
CVE-2026-0879 Sandbox escape due to incorrect boundary conditions in the Graphics component
CVE-2026-0881 Sandbox escape in the Messaging System component
CVE-2026-0880 Sandbox escape due to integer overflow in the Graphics component
CVE-2026-0883 Information disclosure in the Networking component
CVE-2026-0882 Use-after-free in the IPC component
CVE-2026-0886 Incorrect boundary conditions in the Graphics component
CVE-2026-0885 Use-after-free in the JavaScript: GC component
CVE-2026-0887 Clickjacking issue, information disclosure in the PDF Viewer component
CVE-2026-0888 Information disclosure in the XML component
CVE-2026-0890 Spoofing issue in the DOM: Copy & Paste and Drag & Drop component
CVE-2026-0889 Denial-of-service in the DOM: Service Workers component
CVE-2026-0891 Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thun
CVE-2026-0892 Memory safety bugs fixed in Firefox 147 and Thunderbird 147

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-0884

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