CVE-2025-26695— Downloading of OpenPGP keys from WKD used incorrect padding
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 136之前版本和128.8之前版本存在安全漏洞，该漏洞源于从WKD服务器请求OpenPGP密钥时使用了不正确的填充大小，可能导致网络观察者获取请求的电子邮件地址长度。
Possible ATT&CK Techniques 1 AI
T1115 · Clipboard Data
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I. Basic Information for CVE-2025-26695
Vulnerability Information
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Vulnerability Title
Downloading of OpenPGP keys from WKD used incorrect padding
Source: CVE Program / CVE List V5
Vulnerability Description
When requesting an OpenPGP key from a WKD server, an incorrect padding size was used and a network observer could have learned the length of the requested email address. This vulnerability was fixed in Thunderbird 136 and Thunderbird 128.8.
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 136之前版本和128.8之前版本存在安全漏洞，该漏洞源于从WKD服务器请求OpenPGP密钥时使用了不正确的填充大小，可能导致网络观察者获取请求的电子邮件地址长度。
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 | 128.8 ~ 128.* | - |
|
II. Public POCs for CVE-2025-26695
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2025-26695 (3)
IV. Related Vulnerabilities
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Mitigation bypass in the DOM: Navigation component -
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V. Comments for CVE-2025-26695
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