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CVE-2026-5731— Memory safety bugs fixed in Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2

AI Predicted 7.5 Difficulty: Easy EPSS 0.07% · P22

Possible ATT&CK Techniques 1AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 5

VendorProductVersion RangeStatus
MozillaFirefox115.34.1≤ 115.*unaffected
140.9.1≤ 140.*unaffected
149.0.2≤ *unaffected
MozillaThunderbird140.9.1≤ 140.*unaffected
149.0.2≤ *unaffected
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I. Basic Information for CVE-2026-5731

Vulnerability Information
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Vulnerability Title
Memory safety bugs fixed in Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2
Source: NVD (National Vulnerability Database)
Vulnerability Description
Memory safety bugs present in Firefox ESR 115.34.0, Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thunderbird 149.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 149.0.2, Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.
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 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，该漏洞源于内存安全问题，可能导致内存损坏并执行任意代码。以下产品及版本受到影响：Firefox 149.0.2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 115.34.1 ~ 115.* -
MozillaThunderbird 140.9.1 ~ 140.* -

II. Public POCs for CVE-2026-5731

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III. Intelligence Information for CVE-2026-5731

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Vendor Advisories for CVE-2026-5731 (2)

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

CVE-2026-5732Incorrect boundary conditions, integer overflow in the Graphics: Text component
CVE-2026-5733Incorrect boundary conditions in the Graphics: WebGPU component
CVE-2026-5734Memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2
CVE-2026-5735Memory 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-2026-5731

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