CVE-2026-39904

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-22. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.5
EG Score
6.5(high)
EPSS
16.1%
KEV
Not listed

Published

June 22, 2026

Last Modified

June 23, 2026

Advisory Details (2)

Auto-updated Jun 23, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

Gophish 0.12.1 Denial of Service via Office Document Upload | Advisories | VulnCheck

https://www.vulncheck.com/advisories/gophish-denial-of-service-via-office-document-upload
generic🟡 PoC Available

GoPhish-0.12.1/Unbounded Memory Allocation in Office Attachment Processing Leads to Server DoS/README.md at main · ashikmd7/GoPhish-0.12.1 · GitHub

https://github.com/ashikmd7/GoPhish-0.12.1/blob/main/Unbounded%20Memory%20Allocation%20in%20Office%20Attachment%20Processing%20Leads%20to%20Server%20DoS/README.md

Vendor Advisories for CVE-2026-39904(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 11:27 UTCEG score recompute
  4. 2026-07-06 11:27 UTCGHSA enrichment
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-05 10:24 UTCEG score recompute
  8. 2026-07-05 10:23 UTCGHSA enrichment
  9. 2026-07-05 02:30 UTCEPSS rescore
  10. 2026-07-04 09:20 UTCEG score recompute
  11. 2026-07-04 09:20 UTCGHSA enrichment
  12. 2026-07-04 06:31 UTCEPSS rescore
  13. 2026-07-03 08:16 UTCEG score recompute
  14. 2026-07-03 08:16 UTCGHSA enrichment
  15. 2026-07-02 07:12 UTCEG score recompute
  16. 2026-07-02 07:12 UTCGHSA enrichment
  17. 2026-07-01 15:06 UTCEPSS rescore
  18. 2026-07-01 06:07 UTCEG score recompute
  19. 2026-07-01 06:07 UTCGHSA enrichment
  20. 2026-06-30 23:22 UTCEPSS rescore
  21. 2026-06-30 05:03 UTCEG score recompute
  22. 2026-06-30 05:03 UTCGHSA enrichment
  23. 2026-06-29 14:06 UTCEPSS rescore
  24. 2026-06-29 04:00 UTCEG score recompute
  25. 2026-06-29 04:00 UTCGHSA enrichment
Show 20 more
  1. 2026-06-28 14:07 UTCEPSS rescore
  2. 2026-06-28 04:56 UTCEPSS rescore
  3. 2026-06-28 02:57 UTCEG score recompute
  4. 2026-06-28 02:57 UTCGHSA enrichment
  5. 2026-06-27 03:08 UTCEPSS rescore
  6. 2026-06-27 01:53 UTCEG score recompute
  7. 2026-06-27 01:53 UTCGHSA enrichment
  8. 2026-06-26 00:51 UTCEG score recompute
  9. 2026-06-26 00:51 UTCGHSA enrichment
  10. 2026-06-25 13:49 UTCEPSS rescore
  11. 2026-06-25 13:49 UTCEPSS rescore
  12. 2026-06-24 23:47 UTCEG score recompute
  13. 2026-06-24 23:47 UTCGHSA enrichment
  14. 2026-06-24 14:05 UTCEPSS rescore
  15. 2026-06-23 22:44 UTCEG score recompute
  16. 2026-06-23 22:44 UTCGHSA enrichment
  17. 2026-06-23 21:33 UTCEPSS rescore
  18. 2026-06-23 14:35 UTCMITRE cvelistV5CVSS v4 → 7.1 · severity → MEDIUM
  19. 2026-06-22 21:38 UTCEG score recompute
  20. 2026-06-22 21:38 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-39904?
CVE-2026-39904 is a medium vulnerability published on June 22, 2026. 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…
When was CVE-2026-39904 disclosed?
CVE-2026-39904 was first published in the National Vulnerability Database on June 22, 2026, with the most recent update on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-39904 actively exploited?
CVE-2026-39904 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 16.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-39904?
CVE-2026-39904 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-39904?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-39904, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-39904

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