CVE-2026-39904Public exploitNetwork attack vector

Authenticated server crash via Office zip bomb

Published Jun 22, 2026 · Updated Jun 22, 2026

Denial of service in Gophish 0.12.1 and earlier allows remote authenticated users to crash the server via a crafted Office attachment. ApplyTemplate() in models/attachment.go reads every uncompressed Office archive entry with ioutil.ReadAll() without enforcing an expanded-size limit. A User-role account is required; one upload can exhaust memory until the operating system terminates the process, interrupting all service.

CVSS severity7.1
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Gophish 0.12.1 and earlier allows remote authenticated users to crash the server via a crafted Office attachment. ApplyTemplate() in models/attachment.go reads every uncompressed Office archive entry with ioutil.ReadAll() without enforcing an expanded-size limit. A User-role account is required; one upload can exhaust memory until the operating system terminates the process, interrupting all service.

The record

CVE
CVE-2026-39904
Published
Jun 22, 2026
Updated
Jun 22, 2026
Vendor
Gophish
Product
Gophish
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=0.12.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Gophish · Gophishversion=0 <=0.12.1

Published CVSS scores

7.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
6.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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