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CVE-2026-2781— Integer overflow in the Libraries component in NSS

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多款产品存在输入验证错误漏洞，该漏洞源于NSS的Libraries组件存在整数溢出。以下产品及版本受到影响：Firefox 148之前版本、Firefox

AI Predicted 8.8 Difficulty: Easy EPSS 0.36% · P29

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-2781

Vulnerability Information
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Vulnerability Title
Integer overflow in the Libraries component in NSS
Source: CVE Program / CVE List V5
Vulnerability Description
Integer overflow in the Libraries component in NSS. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, Thunderbird 140.8, and Firefox ESR 115.35.
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多款产品 输入验证错误漏洞
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多款产品存在输入验证错误漏洞，该漏洞源于NSS的Libraries组件存在整数溢出。以下产品及版本受到影响：Firefox 148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

Vendor Product Affected Versions CPE Subscribe
Mozilla Firefox 115.35 ~ 115.* -
Mozilla Thunderbird 140.8 ~ 140.* -

II. Public POCs for CVE-2026-2781

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III. Intelligence Information for CVE-2026-2781

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Vendor Advisories for CVE-2026-2781 (5)

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-2026-2782 Privilege escalation in the Netmonitor component

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

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-2781

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