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CVE-2026-5732— Incorrect boundary conditions, integer overflow in the Graphics: Text 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多款产品存在安全漏洞，该漏洞源于Graphics: Text组件存在边界条件错误和整数溢出。以下产品及版本受到影响：Firefox 149.0.2之前版本、

AI Predicted 7.5 Difficulty: Moderate EPSS 0.35% · P28

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 4

VendorProduct Version RangeStatus
Mozilla Firefox 140.9.1≤ 140.* unaffected
149.0.2≤ * unaffected
Mozilla Thunderbird 140.9.1≤ 140.* unaffected
149.0.2≤ * unaffected
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I. Basic Information for CVE-2026-5732

Vulnerability Information
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Vulnerability Title
Incorrect boundary conditions, integer overflow in the Graphics: Text component
Source: CVE Program / CVE List V5
Vulnerability Description
Incorrect boundary conditions, integer overflow in the Graphics: Text component. This vulnerability was fixed in Firefox 149.0.2, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.
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多款产品 安全漏洞
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多款产品存在安全漏洞，该漏洞源于Graphics: Text组件存在边界条件错误和整数溢出。以下产品及版本受到影响：Firefox 149.0.2之前版本、
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 140.9.1 ~ 140.* -
Mozilla Thunderbird 140.9.1 ~ 140.* -

II. Public POCs for CVE-2026-5732

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III. Intelligence Information for CVE-2026-5732

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Vendor Advisories for CVE-2026-5732 (2)

Same Patch Batch · Mozilla · 2026-04-07 · 5 CVEs total

CVE-2026-5731 Memory safety bugs fixed in Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird ESR 140
CVE-2026-5733 Incorrect boundary conditions in the Graphics: WebGPU component
CVE-2026-5734 Memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2
CVE-2026-5735 Memory safety bugs fixed in Firefox 149.0.2 and Thunderbird 149.0.2

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-5732

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