Is CVE-2026-39904 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-39904?

CVE-2026-39904 has a CVSS v3 severity of MEDIUM (6.5).

Back

CVE-2026-39904

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.