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CVE-2025-5262

Quick assessment

Affected
Mozilla Thunderbird
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 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 139之前版本和128.11之前版本存在安全漏洞，该漏洞源于vpx_codec_enc_init_multi函数在分配失败时发生双重释放，可能导致内存损坏和崩溃。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.45% · P37

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-5262

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A double-free could have occurred in `vpx_codec_enc_init_multi` after a failed allocation when initializing the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 139 and Thunderbird < 128.11.
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 Thunderbird 安全漏洞
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 139之前版本和128.11之前版本存在安全漏洞，该漏洞源于vpx_codec_enc_init_multi函数在分配失败时发生双重释放，可能导致内存损坏和崩溃。
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 Thunderbird unspecified ~ 139 -
Mozilla Thunderbird unspecified ~ 128.11 -

II. Public POCs for CVE-2025-5262

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III. Intelligence Information for CVE-2025-5262

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Vendor Advisories for CVE-2025-5262 (5)

Same Patch Batch · Mozilla · 2025-05-27 · 11 CVEs total

CVE-2025-5272 Memory safety bugs fixed in Firefox 139 and Thunderbird 139
CVE-2025-5270 SNI was sometimes unencrypted
CVE-2025-5271 Devtools' preview ignored CSP headers
CVE-2025-5269 Memory safety bug fixed in Firefox ESR 128.11 and Thunderbird 128.11
CVE-2025-5268 Memory safety bugs fixed in Firefox 139, Thunderbird 139, Firefox ESR 128.11, and Thunderb
CVE-2025-5267 Clickjacking vulnerability could have led to leaking saved payment card details
CVE-2025-5266 Script element events leaked cross-origin resource status
CVE-2025-5264 Potential local code execution in “Copy as cURL” command
CVE-2025-5265 Potential local code execution in “Copy as cURL” command
CVE-2025-5263 Error handling for script execution was incorrectly isolated from web content

IV. Related Vulnerabilities

Same product: Thunderbird
Same vendor: Mozilla

V. Comments for CVE-2025-5262

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