CVE-2026-39904
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk16th percentile — higher than 16% of all known CVEs
Summary
Gophish through version 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 processes Office documents as ZIP archives, allowing a zip bomb payload to be exploited.
Risk Assessment
This vulnerability can lead to server crashes, resulting in service availability interruptions. It allows attackers with User role to disrupt system operations by consuming memory resources.
Recommendation
It is recommended to update Gophish to the latest version to mitigate this vulnerability. Additionally, implementing attachment size restrictions and monitoring User role activities is advisable.
Original NVD description (English source)
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.