CVE-2025-6436— Memory safety bugs fixed in Firefox 140 and Thunderbird 140
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I. Basic Information for CVE-2025-6436
Vulnerability Information
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Vulnerability Title
Memory safety bugs fixed in Firefox 140 and Thunderbird 140
Source: NVD (National Vulnerability Database)
Vulnerability Description
Memory safety bugs present in Firefox 139 and Thunderbird 139. 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 140 and Thunderbird 140.
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 Firefox 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox是美国Mozilla基金会的一款开源Web浏览器。 Firefox 140之前版本存在安全漏洞，该漏洞源于内存安全问题可能导致内存损坏，进而执行任意代码。
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
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Mozilla | Firefox | 140 ~ * | - | |
| Mozilla | Thunderbird | 140 ~ * | - |
II. Public POCs for CVE-2025-6436
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mozilla · 2025-06-24 · 13 CVEs total
| CVE-2025-6435 | Save as in Devtools could download files without sanitizing the extension | |
| CVE-2025-6432 | DNS Requests leaked outside of a configured SOCKS proxy | |
| CVE-2025-6434 | HTTPS-Only exception screen lacked anti-clickjacking delay | |
| CVE-2025-6433 | WebAuthn would allow a user to sign a challenge on a webpage with an invalid TLS certifica | |
| CVE-2025-6431 | The prompt in Firefox for Android that asks before opening a link in an external applicati | |
| CVE-2025-6428 | Firefox for Android opened URLs specified in a link querystring parameter | |
| CVE-2025-6429 | Incorrect parsing of URLs could have allowed embedding of youtube.com | |
| CVE-2025-6430 | Content-Disposition header ignored when a file is included in an embed or object tag | |
| CVE-2025-6427 | connect-src Content Security Policy restriction could be bypassed | |
| CVE-2025-6426 | No warning when opening executable terminal files on macOS | |
| CVE-2025-6424 | Use-after-free in FontFaceSet | |
| CVE-2025-6425 | The WebCompat WebExtension shipped with Firefox exposed a persistent UUID |
IV. Related Vulnerabilities
Same product: Firefox
- CVE-2026-8093
Memory safety bugs fixed in Thunderbird 150.0.2 - CVE-2026-8094
Other issue in the WebRTC component - CVE-2026-8092
Memory safety bugs fixed in Thunderbird ESR 140.10.2 and Thu - CVE-2026-8091
Incorrect boundary conditions in the Audio/Video: Playback c - CVE-2026-8090
Use-after-free in the DOM: Networking component
Same vendor: Mozilla
- CVE-2026-8093
Memory safety bugs fixed in Thunderbird 150.0.2 - CVE-2026-8094
Other issue in the WebRTC component - CVE-2026-8092
Memory safety bugs fixed in Thunderbird ESR 140.10.2 and Thu - CVE-2026-8091
Incorrect boundary conditions in the Audio/Video: Playback c - CVE-2026-8090
Use-after-free in the DOM: Networking component
V. Comments for CVE-2025-6436
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