Medium severity6.5NVD Advisory· Published Jun 22, 2026· Updated Jul 14, 2026
CVE-2026-39904
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/gophish/gophishGo | <= 0.12.1 | — |
Affected products
2- osv-coordsRange: < 0.0.20260827T195228-160000.1.1
Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-42jc-v69j-g38fghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-39904ghsaADVISORY
- github.com/ashikmd7/GoPhish-0.12.1/blob/main/Unbounded%20Memory%20Allocation%20in%20Office%20Attachment%20Processing%20Leads%20to%20Server%20DoS/README.mdnvdWEB
- www.vulncheck.com/advisories/gophish-denial-of-service-via-office-document-uploadnvdWEB
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