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CVE-2026-39904— Gophish 0.12.1 Denial of Service via Office Document Upload

Quick assessment

Affected
gophish gophish
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.

GoPhish是GoPhish公司开源的一款开源的网络钓鱼框架。 Gophish 0.12.1及之前版本存在资源管理错误漏洞，该漏洞源于ApplyTemplate()函数在处理Office文档作为邮件模板附件时，未对未压缩内容实施大小限制，允许已认证用户上传特制Office文档耗尽服务器内存，导致进程被操作系统终止。

CVSS 6.5 · Medium EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
gophish gophish ≤ 0.12.1 affected
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I. Basic Information for CVE-2026-39904

Vulnerability Information
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Vulnerability Title
Gophish 0.12.1 Denial of Service via Office Document Upload
Source: CVE Program / CVE List V5
Vulnerability Description
Gophish through 0.12.1 contains a denial of service vulnerability that allows authenticated users with the User role to exhaust server memory by uploading a crafted Office document as an email template attachment. The ApplyTemplate() function in models/attachment.go processes Office documents as ZIP archives and calls ioutil.ReadAll() on each contained file entry without enforcing size restrictions on uncompressed content, allowing a zip bomb payload to expand to several gigabytes in memory and cause the process to be terminated by the operating system.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
GoPhish 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GoPhish是GoPhish公司开源的一款开源的网络钓鱼框架。 Gophish 0.12.1及之前版本存在资源管理错误漏洞，该漏洞源于ApplyTemplate()函数在处理Office文档作为邮件模板附件时，未对未压缩内容实施大小限制，允许已认证用户上传特制Office文档耗尽服务器内存，导致进程被操作系统终止。
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
gophish gophish 0 ~ 0.12.1 -

II. Public POCs for CVE-2026-39904

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III. Intelligence Information for CVE-2026-39904

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Vendor Advisories for CVE-2026-39904 (1)

Proof of Concept for CVE-2026-39904 (1)

IV. Related Vulnerabilities

Same product: gophish
Same vendor: gophish
Same weakness: CWE-770

V. Comments for CVE-2026-39904

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