CVE-2026-8391— Other issue in the JavaScript Engine component
Possible ATT&CK Techniques 1AI
T1203 · Exploitation for Client ExecutionAffected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Mozilla | Firefox | 115.36≤ 115.* | unaffected |
140.11≤ 140.* | unaffected | ||
150.0.3≤ * | unaffected | ||
| Mozilla | Thunderbird | 140.11≤ * | unaffected |
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I. Basic Information for CVE-2026-8391
Vulnerability Information
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Vulnerability Title
Other issue in the JavaScript Engine component
Source: NVD (National Vulnerability Database)
Vulnerability Description
Other issue in the JavaScript Engine component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Mozilla Firefox 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox是美国Mozilla基金会的一款开源Web浏览器。 Mozilla Firefox 150.0.3之前版本存在安全漏洞，该漏洞源于JavaScript Engine组件其他问题。
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 | 115.36 ~ 115.* | - | |
| Mozilla | Thunderbird | 140.11 ~ * | - |
II. Public POCs for CVE-2026-8391
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mozilla · 2026-05-12 · 5 CVEs total
| CVE-2026-8388 | Incorrect boundary conditions in the JavaScript Engine: JIT component | |
| CVE-2026-8389 | JIT miscompilation in the JavaScript Engine: JIT component | |
| CVE-2026-8390 | Use-after-free in the JavaScript: WebAssembly component | |
| CVE-2026-8401 | Sandbox escape in the Profile Backup component |
IV. Related Vulnerabilities
Same product: Firefox
- CVE-2026-8975
Memory safety bugs fixed in Thunderbird 140.11 and Thunderbi - CVE-2026-8974
Memory safety bugs fixed in Thunderbird 140.11 and Thunderbi - CVE-2026-8973
Memory safety bugs fixed in Thunderbird 151 - CVE-2026-8972
Privilege escalation in the WebRTC: Audio/Video component - CVE-2026-8971
Same-origin policy bypass in the Networking: JAR component
Same vendor: Mozilla
- CVE-2026-8706
Sensitive user data could be leaked to other applications th - CVE-2026-8975
Memory safety bugs fixed in Thunderbird 140.11 and Thunderbi - CVE-2026-8974
Memory safety bugs fixed in Thunderbird 140.11 and Thunderbi - CVE-2026-8973
Memory safety bugs fixed in Thunderbird 151 - CVE-2026-8972
Privilege escalation in the WebRTC: Audio/Video component
V. Comments for CVE-2026-8391
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