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CVE-2026-6785— Memory safety bugs fixed in Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150

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多款产品存在缓冲区错误漏洞，该漏洞源于内存安全错误，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 ESR 115.34之前版本、F

AI Predicted 7.8 Difficulty: Easy EPSS 0.53% · P43

Affected Version Matrix 5

VendorProduct Version RangeStatus
Mozilla Firefox 115.35≤ 115.* unaffected
140.10≤ 140.* unaffected
150≤ * unaffected
Mozilla Thunderbird 140.10≤ 140.* unaffected
150≤ * unaffected
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I. Basic Information for CVE-2026-6785

Vulnerability Information
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Vulnerability Title
Memory safety bugs fixed in Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150
Source: CVE Program / CVE List V5
Vulnerability Description
Memory safety bugs present in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149. 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 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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 缓冲区错误漏洞
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多款产品存在缓冲区错误漏洞，该漏洞源于内存安全错误，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 ESR 115.34之前版本、F
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 140.10 ~ 140.* -

II. Public POCs for CVE-2026-6785

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III. Intelligence Information for CVE-2026-6785

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Vendor Advisories for CVE-2026-6785 (5)

Same Patch Batch · Mozilla · 2026-04-21 · 41 CVEs total

CVE-2026-6777 Other issue in the Networking: DNS component
CVE-2026-6766 Incorrect boundary conditions in the Libraries component in NSS
CVE-2026-6768 Mitigation bypass in the Networking: Cookies component
CVE-2026-6769 Privilege escalation in the Debugger component
CVE-2026-6770 Other issue in the Storage: IndexedDB component
CVE-2026-6771 Mitigation bypass in the DOM: Security component
CVE-2026-6772 Incorrect boundary conditions in the Libraries component in NSS
CVE-2026-6773 Denial-of-service due to integer overflow in the Graphics: WebGPU component
CVE-2026-6774 Mitigation bypass in the DOM: Security component
CVE-2026-6775 Incorrect boundary conditions in the WebRTC component
CVE-2026-6767 Other issue in the Libraries component in NSS
CVE-2026-6776 Incorrect boundary conditions in the WebRTC: Networking component
CVE-2026-6778 Invalid pointer in the Audio/Video: Playback component
CVE-2026-6780 Denial-of-service in the Audio/Video: Playback component
CVE-2026-6779 Other issue in the JavaScript Engine component
CVE-2026-6781 Denial-of-service in the Audio/Video: Playback component
CVE-2026-6783 Incorrect boundary conditions, integer overflow in the Audio/Video: Playback component
CVE-2026-6782 Information disclosure in the IP Protection component
CVE-2026-6784 Memory safety bugs fixed in Firefox 150 and Thunderbird 150
CVE-2026-6786 Memory safety bugs fixed in Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Th

Showing top 20 of 41 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-6785

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