{"id":"CVE-2026-39904","title":"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","summary":"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() fun…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-770"],"vendor":"gophish","product":"gophish","affected":["gophish <= 0.12.1"],"published":"2026-06-22","updated":"2026-10-08","sourceUpdated":"2026-10-08T16:17:14.223","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-39904","references":[{"url":"https://github.com/ashikmd7/GoPhish-0.12.1/blob/main/Unbounded%20Memory%20Allocation%20in%20Office%20Attachment%20Processing%20Leads%20to%20Server%20DoS/README.md","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/gophish-denial-of-service-via-office-document-upload","label":"disclosure@vulncheck.com"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39904"},{"url":"https://github.com/gophish/gophish"}],"tags":["nvd","cve.org","exploit-available","osv","go"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-23T14:09:33.438481Z"},"epss":0.00436,"epssPercentile":0.3766,"aliases":["GHSA-42jc-v69j-g38f"],"ecosystem":"go","ingestedAt":"2026-08-07T19:14:15.621Z","slug":"CVE-2026-39904","body":"## Overview\n\nGophish 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-39904)\n\nAffected packages:\n\n- `github.com/gophish/gophish <= 0.12.1`\n\nSource: https://osv.dev/vulnerability/GHSA-42jc-v69j-g38f","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":218123,"id":"CVE-2026-39904","ts":1791478409473,"field":"exploit_available","old":"false","new":"true"}]}