CVE-2026-2447— Heap buffer overflow in libvpx
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等都是美国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 Thunderbird是一套从Mozilla Application Suite独立出来的电子邮件客户端软件。 Mozilla多款产品存在安全漏洞，该漏洞源于libvpx存在堆缓冲区溢出。以下产品和版本受到影响：Firefox 147.0.4之前版本、Firefox ESR 140
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 5
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Mozilla | Firefox | 115.32.1≤ 115.* |
unaffected |
140.7.1≤ 140.* |
unaffected | ||
147.0.4≤ * |
unaffected | ||
| Mozilla | Thunderbird | 140.7.2≤ 140.* |
unaffected |
147.0.2≤ * |
unaffected |
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I. Basic Information for CVE-2026-2447
Vulnerability Information
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Vulnerability Title
Heap buffer overflow in libvpx
Source: CVE Program / CVE List V5
Vulnerability Description
Heap buffer overflow in libvpx. This vulnerability was fixed in Firefox 147.0.4, Firefox ESR 140.7.1, Firefox ESR 115.32.1, Thunderbird 140.7.2, and Thunderbird 147.0.2.
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多款产品 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox等都是美国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 Thunderbird是一套从Mozilla Application Suite独立出来的电子邮件客户端软件。 Mozilla多款产品存在安全漏洞，该漏洞源于libvpx存在堆缓冲区溢出。以下产品和版本受到影响：Firefox 147.0.4之前版本、Firefox ESR 140
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 | 115.32.1 ~ 115.* | - |
|
| Mozilla | Thunderbird | 140.7.2 ~ 140.* | - |
|
II. Public POCs for CVE-2026-2447
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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IV. Related Vulnerabilities
Same product: Firefox
-
CVE-2026-74989
Internally found bugs fixed in Firefox 154 -
CVE-2026-74988
Internally found bugs fixed in Firefox ESR 153.1 and Firefox -
CVE-2026-74984
Race condition in the JavaScript Engine component -
CVE-2026-74985
Privilege escalation in the Enterprise Policies component -
CVE-2026-74982
Denial-of-service in the Widget component
Same vendor: Mozilla
-
CVE-2026-74989
Internally found bugs fixed in Firefox 154 -
CVE-2026-74988
Internally found bugs fixed in Firefox ESR 153.1 and Firefox -
CVE-2026-74984
Race condition in the JavaScript Engine component -
CVE-2026-74985
Privilege escalation in the Enterprise Policies component -
CVE-2026-74982
Denial-of-service in the Widget component
V. Comments for CVE-2026-2447
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