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CVE-2026-4701— Use-after-free in the JavaScript Engine component

EPSS 0.03% · P7
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I. Basic Information for CVE-2026-4701

Vulnerability Information
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Vulnerability Title
Use-after-free in the JavaScript Engine component
Source: NVD (National Vulnerability Database)
Vulnerability Description
Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
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多款产品 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox等都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Firefox ESR是Firefox(Web浏览器)的一个延长支持版本。Mozilla Thunderbird是一套从Mozilla Application Suite独立出来的电子邮件客户端软件。 Mozilla多款产品存在资源管理错误漏洞，该漏洞源于JavaScript引擎组件存在释放后重用。以下产品及版本受到影响：Firefox 149之前版本、Firefox
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 140.9 ~ 140.* -
MozillaThunderbird 140.9 ~ 140.* -

II. Public POCs for CVE-2026-4701

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III. Intelligence Information for CVE-2026-4701

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Same Patch Batch · Mozilla · 2026-03-24 · 47 CVEs total

CVE-2026-4715Uninitialized memory in the Graphics: Canvas2D component
CVE-2026-4727Denial-of-service in the Libraries component in NSS
CVE-2026-4728Spoofing issue in the Privacy: Anti-Tracking component
CVE-2026-4719Incorrect boundary conditions in the Graphics: Text component
CVE-2026-4729Memory safety bugs fixed in Firefox 149 and Thunderbird 149
CVE-2026-4721Memory safety bugs fixed in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9,
CVE-2026-3889Spoofing issue in Thunderbird
CVE-2026-4371Out of bounds read in IMAP parsing
CVE-2026-4720Memory safety bugs fixed in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thun
CVE-2026-4716Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component
CVE-2026-4717Privilege escalation in the Netmonitor component
CVE-2026-4714Incorrect boundary conditions in the Audio/Video component
CVE-2026-4713Incorrect boundary conditions in the Graphics component
CVE-2026-4725Sandbox escape due to use-after-free in the Graphics: Canvas2D component
CVE-2026-4712Information disclosure in the Widget: Cocoa component
CVE-2026-4710Incorrect boundary conditions in the Audio/Video component
CVE-2026-4711Use-after-free in the Widget: Cocoa component
CVE-2026-4709Incorrect boundary conditions in the Audio/Video: GMP component
CVE-2026-4708Incorrect boundary conditions in the Graphics component
CVE-2026-4707Incorrect boundary conditions in the Graphics: Canvas2D component

Showing top 20 of 47 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-4701

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