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CVE-2026-0892— Memory safety bugs fixed in Firefox 147 and Thunderbird 147

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 Thunderbird都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Thunderbird是一套从Mozilla Application Suite独立出来的电子邮件客户端软件。该软件支持IMAP、POP邮件协议以及HTML邮件格式。 Mozilla Firefox 146版本和Mozilla Thunderbird 146版本存在安全漏洞，该漏洞源于内存安全问题，可能导致内存损坏和执行任意代码。

AI Predicted 8.8 Difficulty: Hard EPSS 0.42% · P35

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-0892

Vulnerability Information
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Vulnerability Title
Memory safety bugs fixed in Firefox 147 and Thunderbird 147
Source: CVE Program / CVE List V5
Vulnerability Description
Memory safety bugs present in Firefox 146 and Thunderbird 146. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 147 and Thunderbird 147.
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 Thunderbird 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox和Mozilla Thunderbird都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Thunderbird是一套从Mozilla Application Suite独立出来的电子邮件客户端软件。该软件支持IMAP、POP邮件协议以及HTML邮件格式。 Mozilla Firefox 146版本和Mozilla Thunderbird 146版本存在安全漏洞，该漏洞源于内存安全问题，可能导致内存损坏和执行任意代码。
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 147 ~ * -
Mozilla Thunderbird 147 ~ * -

II. Public POCs for CVE-2026-0892

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III. Intelligence Information for CVE-2026-0892

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Vendor Advisories for CVE-2026-0892 (3)

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-2026-0884 Use-after-free in the JavaScript Engine 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

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-0892

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