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CVE-2026-12303— Information disclosure due to incorrect boundary conditions in the Graphics: WebGPU component

AI Predicted 5.3 Difficulty: Moderate EPSS 0.22% · P13

Possible ATT&CK Techniques 1AI

T1561.001 · Disk Content Wipe

Affected Version Matrix 2

VendorProductVersion RangeStatus
MozillaFirefox152≤ *unaffected
MozillaThunderbird152≤ *unaffected
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I. Basic Information for CVE-2026-12303

Vulnerability Information
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Vulnerability Title
Information disclosure due to incorrect boundary conditions in the Graphics: WebGPU component
Source: CVE Program / CVE List V5
Vulnerability Description
Information disclosure due to incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 152 and Thunderbird 152.
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Mozilla基金会开源的一款Web浏览器。 Mozilla Firefox 152之前版本和Thunderbird 152之前版本存在缓冲区错误漏洞，该漏洞源于Graphics: WebGPU组件中存在不正确的边界条件，可能导致信息泄露。
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 152 ~ * -
MozillaThunderbird 152 ~ * -

II. Public POCs for CVE-2026-12303

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III. Intelligence Information for CVE-2026-12303

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Vendor Advisories for CVE-2026-12303 (2)

Other References for CVE-2026-12303 (1)

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

CVE-2026-12300Memory safety bug fixed in Firefox 152
CVE-2026-12297Sandbox escape due to incorrect boundary conditions in the Networking component
CVE-2026-12298Memory safety bug fixed in Firefox 152
CVE-2026-12296Sandbox escape in the Security: Process Sandboxing 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-2026-12299JIT miscompilation in the DOM: Core & HTML component
CVE-2026-12301Memory safety bug fixed in Firefox 152
CVE-2026-12302Mitigation bypass in the DOM: Security component
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-2026-12303

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