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CVE-2025-5986— Unsolicited File Download, Disk Space Exhaustion, and Credential Leakage via mailbox:/// Links

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 128.11.1之前版本和139.0.2之前版本存在安全漏洞，该漏洞源于自动下载行为，可能导致磁盘填充或凭据泄露。

AI Predicted 7.5 Difficulty: Easy EPSS 0.58% · P46
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I. Basic Information for CVE-2025-5986

Vulnerability Information
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Vulnerability Title
Unsolicited File Download, Disk Space Exhaustion, and Credential Leakage via mailbox:/// Links
Source: CVE Program / CVE List V5
Vulnerability Description
A crafted HTML email using mailbox:/// links can trigger automatic, unsolicited downloads of .pdf files to the user's desktop or home directory without prompting, even if auto-saving is disabled. This behavior can be abused to fill the disk with garbage data (e.g. using /dev/urandom on Linux) or to leak Windows credentials via SMB links when the email is viewed in HTML mode. While user interaction is required to download the .pdf file, visual obfuscation can conceal the download trigger. Viewing the email in HTML mode is enough to load external content. This vulnerability was fixed in Thunderbird 128.11.1 and Thunderbird 139.0.2.
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 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 128.11.1之前版本和139.0.2之前版本存在安全漏洞，该漏洞源于自动下载行为，可能导致磁盘填充或凭据泄露。
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 128.11.1 ~ 128.* -

II. Public POCs for CVE-2025-5986

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III. Intelligence Information for CVE-2025-5986

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Same Patch Batch · Mozilla · 2025-06-11 · 4 CVEs total

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CVE-2025-49709 Memory corruption in canvas surfaces
CVE-2025-5687 Local privilege escalation vulnerability in Mozilla VPN clients for macOS v2.27.0 and belo

IV. Related Vulnerabilities

Same product: Thunderbird
Same vendor: Mozilla

V. Comments for CVE-2025-5986

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