Is CVE-2026-39904 actively exploited?

No active exploitation of CVE-2026-39904 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-39904 be exploited remotely?

Yes. CVE-2026-39904 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-39904?

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

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MEDIUM

CVE-2026-39904

CWE-770Published: June 22, 2026· Updated: Jun 23, 2026

6.5

CVSS v3.1

EPSS:0.25%probability of exploitation in 30 daysPercentile:15.9th

Official 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.

NVD Source

Technical Analysis

CVE-2026-39904 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.