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CVE-2026-8091— Incorrect boundary conditions in the Audio/Video: Playback 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，该漏洞源于音频视频播放组件中的边界条件错误。以下产品及版本受到影响：Firefox 150之前版本、Thunderbird 150之前

AI Predicted 9.1 Difficulty: Moderate EPSS 0.60% · P47

Affected Version Matrix 5

VendorProduct Version RangeStatus
Mozilla Firefox 115.35.2≤ 115.* unaffected
140.10.1≤ 140.* unaffected
150≤ * unaffected
Mozilla Thunderbird 140.10.1≤ 140.* unaffected
150≤ * unaffected
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I. Basic Information for CVE-2026-8091

Vulnerability Information
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Vulnerability Title
Incorrect boundary conditions in the Audio/Video: Playback component
Source: CVE Program / CVE List V5
Vulnerability Description
Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.
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，该漏洞源于音频视频播放组件中的边界条件错误。以下产品及版本受到影响：Firefox 150之前版本、Thunderbird 150之前
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 115.35.2 ~ 115.* -
Mozilla Thunderbird 140.10.1 ~ 140.* -

II. Public POCs for CVE-2026-8091

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III. Intelligence Information for CVE-2026-8091

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Vendor Advisories for CVE-2026-8091 (6)

Same Patch Batch · Mozilla · 2026-05-07 · 5 CVEs total

CVE-2026-8090 Use-after-free in the DOM: Networking component
CVE-2026-8092 Memory safety bugs fixed in Firefox ESR 115.35.2, Firefox ESR 140.10.2 and Firefox 150.0.2
CVE-2026-8093 Memory safety bugs fixed in Firefox 150.0.2
CVE-2026-8094 Other issue in the WebRTC component

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-8091

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