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CVE-2026-7321— Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking 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 ESR是美国Mozilla基金会的Firefox(Web浏览器)的一个延长支持版本。 Mozilla Firefox ESR 140.10.1之前版本存在安全漏洞，该漏洞源于WebRTC: Networking组件边界条件不正确，可能导致沙箱逃逸。

AI Predicted 9.8 Difficulty: Hard EPSS 0.45% · P37

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services

Affected Version Matrix 4

VendorProduct Version RangeStatus
Mozilla Firefox 140.10.1≤ 140.* unaffected
150≤ * unaffected
Mozilla Thunderbird 140.10.1≤ 140.* unaffected
150≤ * unaffected
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I. Basic Information for CVE-2026-7321

Vulnerability Information
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Vulnerability Title
Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component
Source: CVE Program / CVE List V5
Vulnerability Description
Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, and Thunderbird 140.10.1.
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 ESR 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox ESR是美国Mozilla基金会的Firefox(Web浏览器)的一个延长支持版本。 Mozilla Firefox ESR 140.10.1之前版本存在安全漏洞，该漏洞源于WebRTC: Networking组件边界条件不正确，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

Vendor Product Affected Versions CPE Subscribe
Mozilla Firefox 140.10.1 ~ 140.* -
Mozilla Thunderbird 140.10.1 ~ 140.* -

II. Public POCs for CVE-2026-7321

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III. Intelligence Information for CVE-2026-7321

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Vendor Advisories for CVE-2026-7321 (4)

Same Patch Batch · Mozilla · 2026-04-28 · 5 CVEs total

CVE-2026-7320 Information disclosure due to incorrect boundary conditions in the Audio/Video component
CVE-2026-7322 Memory safety bugs fixed in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1
CVE-2026-7323 Memory safety bugs fixed in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1
CVE-2026-7324 Memory safety bugs fixed in Thunderbird 150.0.1

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-7321

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