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CVE-2026-8973— Memory safety bugs fixed in Firefox 151

AI Predicted 8.5 Difficulty: Moderate EPSS 0.32% · P24

Possible ATT&CK Techniques 1AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 2

VendorProductVersion RangeStatus
MozillaFirefox151≤ *unaffected
MozillaThunderbird151≤ *unaffected
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I. Basic Information for CVE-2026-8973

Vulnerability Information
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Vulnerability Title
Memory safety bugs fixed in Firefox 151
Source: NVD (National Vulnerability Database)
Vulnerability Description
Memory safety bugs present in Firefox 150. 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 151 and Thunderbird 151.
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 Thunderbird 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Thunderbird是美国Mozilla基金会的一套从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 Thunderbird 150版本存在缓冲区错误漏洞，该漏洞源于内存安全缺陷，可能导致内存损坏，进而被利用执行任意代码。
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 151 ~ * -
MozillaThunderbird 151 ~ * -

II. Public POCs for CVE-2026-8973

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III. Intelligence Information for CVE-2026-8973

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Vendor Advisories for CVE-2026-8973 (3)

Same Patch Batch · Mozilla · 2026-05-19 · 32 CVEs total

CVE-2026-8960Spoofing issue in WebExtensions
CVE-2026-8706Sensitive user data could be leaked to other applications through Reader mode
CVE-2026-8975Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR 140.11 and Firefox 151
CVE-2026-8974Memory safety bugs fixed in Firefox ESR 140.11 and Firefox 151
CVE-2026-8972Privilege escalation in the WebRTC: Audio/Video component
CVE-2026-8971Same-origin policy bypass in the Networking: JAR component
CVE-2026-8970Privilege escalation in the Security component
CVE-2026-8969Mitigation bypass in the DOM: Security component
CVE-2026-8968Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component
CVE-2026-8967Information disclosure in the Graphics: WebGPU component
CVE-2026-8966Information disclosure in the IP Protection component
CVE-2026-8965Information disclosure in the DOM: Security component
CVE-2026-8964Spoofing issue in the Popup Blocker component
CVE-2026-8963Spoofing issue in the Web Speech component
CVE-2026-8962Mitigation bypass in the DOM: Security component
CVE-2026-8961Spoofing issue in the Form Autofill component
CVE-2026-8945Sandbox escape in Firefox and Firefox Focus for Android
CVE-2026-8959Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component
CVE-2026-8958Information disclosure, sandbox escape in the Security: Process Sandboxing component
CVE-2026-8957Privilege escalation in the Enterprise Policies component

Showing top 20 of 32 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-8973

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