CVE-2026-39904

MEDIUM 6.5

Gophish 0.12.1 Denial of Service via Office Document Upload

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-770
Vendor	gophish
Product	gophish
Published	Jun 22, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

gophish / gophish

0 ≤ 0.12.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/ashikmd7/GoPhish-0.12.1/blob/main/Unbounded%20Memory%20Allocation%20in%20Office%20Attachment%20Processing%20Leads%20to%20Server%20DoS/README.md vulncheck.com: https://www.vulncheck.com/advisories/gophish-denial-of-service-via-office-document-upload

Credits

Ashik Mohamed (ashikmd7)