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CVE-2026-8388— Incorrect boundary conditions in the JavaScript Engine: JIT 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之前版本存在缓冲区错误漏洞，该漏洞源于JavaScript Engine: JIT组件边界条件错误。

AI Predicted 8.8 Difficulty: Moderate EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 4

VendorProduct Version RangeStatus
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-2026-8388

Vulnerability Information
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Vulnerability Title
Incorrect boundary conditions in the JavaScript Engine: JIT component
Source: CVE Program / CVE List V5
Vulnerability Description
Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
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 缓冲区错误漏洞
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之前版本存在缓冲区错误漏洞，该漏洞源于JavaScript Engine: JIT组件边界条件错误。
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-2026-8388

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III. Intelligence Information for CVE-2026-8388

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Vendor Advisories for CVE-2026-8388 (4)

Same Patch Batch · Mozilla · 2026-05-12 · 5 CVEs total

CVE-2026-8389 JIT miscompilation in the JavaScript Engine: JIT component
CVE-2026-8390 Use-after-free in the JavaScript: WebAssembly component
CVE-2026-8391 Other issue in the JavaScript Engine component
CVE-2026-8401 Sandbox escape in the Profile Backup component

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-8388

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