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CVE-2026-12296— Sandbox escape in the Security: Process Sandboxing component

AI Predicted 8.8 Difficulty: Hard EPSS 0.39% · P32

Possible ATT&CK Techniques 1AI

T1211 · Exploitation for Stealth

Affected Version Matrix 4

VendorProductVersion RangeStatus
MozillaFirefox140.12≤ 140.*unaffected
152≤ *unaffected
MozillaThunderbird140.12≤ 140.*unaffected
152≤ *unaffected
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I. Basic Information for CVE-2026-12296

Vulnerability Information
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Vulnerability Title
Sandbox escape in the Security: Process Sandboxing component
Source: CVE Program / CVE List V5
Vulnerability Description
Sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.
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 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox是Mozilla基金会开源的一款Web浏览器。 Mozilla Firefox 152之前版本和Firefox ESR 140.12之前版本和Mozilla Thunderbird 152之前版本和Thunderbird 140.12之前版本存在处理逻辑错误漏洞，该漏洞源于Security: Process Sandboxing组件问题，可能导致沙箱逃逸。
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

VendorProductAffected VersionsCPESubscribe
MozillaFirefox 140.12 ~ 140.* -
MozillaThunderbird 140.12 ~ 140.* -

II. Public POCs for CVE-2026-12296

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III. Intelligence Information for CVE-2026-12296

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Vendor Advisories for CVE-2026-12296 (4)

Same Patch Batch · Mozilla · 2026-06-16 · 44 CVEs total

CVE-2026-12301Memory safety bug fixed in Firefox 152
CVE-2026-12298Memory safety bug fixed in Firefox 152
CVE-2026-12299JIT miscompilation in the DOM: Core & HTML component
CVE-2026-12297Sandbox escape due to incorrect boundary conditions in the Networking component
CVE-2026-12293Use-after-free in the Graphics: WebGPU component
CVE-2026-12292Incorrect boundary conditions in the Web Audio component
CVE-2026-12291Use-after-free in the Networking: HTTP component
CVE-2026-12290Memory safety bug fixed in Firefox 152
CVE-2026-12289Privilege escalation in the Graphics: WebRender component
CVE-2026-12294Sandbox escape in the DOM: Workers component
CVE-2026-12300Memory safety bug fixed in Firefox 152
CVE-2026-12302Mitigation bypass in the DOM: Security component
CVE-2026-12303Information disclosure due to incorrect boundary conditions in the Graphics: WebGPU compon
CVE-2026-12304Same-origin policy bypass in the Networking: Cookies component
CVE-2026-12305Memory safety bug fixed in Firefox 152
CVE-2026-12306Memory safety bug fixed in Firefox 152
CVE-2026-12307Memory safety bug fixed in Firefox 152
CVE-2026-12308Memory safety bug fixed in Firefox 152
CVE-2026-12309Memory safety bug fixed in Firefox 152
CVE-2026-12310Memory safety bug fixed in Firefox 152

Showing top 20 of 44 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-12296

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