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CVE-2026-2796— JIT miscompilation in the JavaScript: WebAssembly 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和Mozilla Thunderbird都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Thunderbird是一套从Mozilla Application Suite独立出来的电子邮件客户端软件。该软件支持IMAP、POP邮件协议以及HTML邮件格式。 Mozilla Firefox 148之前版本和Mozilla Thunderbird 148之前版本存在安全漏洞，该漏洞源于JavaScript: WebAssem

AI Predicted 8.6 Difficulty: Hard EPSS 0.62% · P47

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 2

VendorProduct Version RangeStatus
Mozilla Firefox 148≤ * unaffected
Mozilla Thunderbird 148≤ * unaffected
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I. Basic Information for CVE-2026-2796

Vulnerability Information
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Vulnerability Title
JIT miscompilation in the JavaScript: WebAssembly component
Source: CVE Program / CVE List V5
Vulnerability Description
JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
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和Mozilla Thunderbird 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox和Mozilla Thunderbird都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Thunderbird是一套从Mozilla Application Suite独立出来的电子邮件客户端软件。该软件支持IMAP、POP邮件协议以及HTML邮件格式。 Mozilla Firefox 148之前版本和Mozilla Thunderbird 148之前版本存在安全漏洞，该漏洞源于JavaScript: WebAssem
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 148 ~ * -
Mozilla Thunderbird 148 ~ * -

II. Public POCs for CVE-2026-2796

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III. Intelligence Information for CVE-2026-2796

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Vendor Advisories for CVE-2026-2796 (2)

Same Patch Batch · Mozilla · 2026-02-24 · 52 CVEs total

CVE-2026-2772 Use-after-free in the Audio/Video: Playback component
CVE-2026-2757 Incorrect boundary conditions in the WebRTC: Audio/Video component
CVE-2026-2758 Use-after-free in the JavaScript: GC component
CVE-2026-2764 JIT miscompilation, use-after-free in the JavaScript Engine: JIT component
CVE-2026-2760 Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component
CVE-2026-2761 Sandbox escape in the Graphics: WebRender component
CVE-2026-2762 Integer overflow in the JavaScript: Standard Library component
CVE-2026-2759 Incorrect boundary conditions in the Graphics: ImageLib component
CVE-2026-2770 Use-after-free in the DOM: Bindings (WebIDL) component
CVE-2026-2771 Undefined behavior in the DOM: Core & HTML component
CVE-2026-2769 Use-after-free in the Storage: IndexedDB component
CVE-2026-2773 Incorrect boundary conditions in the Web Audio component
CVE-2026-2774 Integer overflow in the Audio/Video component
CVE-2026-2775 Mitigation bypass in the DOM: HTML Parser component
CVE-2026-2776 Sandbox escape due to incorrect boundary conditions in the Telemetry component in External
CVE-2026-2777 Privilege escalation in the Messaging System component
CVE-2026-2778 Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component
CVE-2026-2779 Incorrect boundary conditions in the Networking: JAR component
CVE-2026-2780 Privilege escalation in the Netmonitor component
CVE-2026-2781 Integer overflow in the Libraries component in NSS

Showing top 20 of 52 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-2796

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