{"id":"CVE-2026-67447","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-67447","generatedAt":"2026-10-28T03:40:55.782Z","title":"Mailpit is an email testing tool and API for developers.","description":"Mailpit is an email testing tool and API for developers. From 1.30.0 until 1.30.5, Mailpit's internal/smtpd/smtpd.go readData() function calls bufio.Reader.ReadBytes before applying the len(data)+len(line) size check to the completed SMTP DATA line against Server.MaxSize. An unauthenticated SMTP client can send a single line larger than the configured MaxMessageSize, causing the full line to be allocated before Mailpit returns the 552 5.3.4 rejection. This post-fix gap remains after normal multi-line DATA accumulation was bounded, and concurrent oversized lines can create substantial memory pressure beyond the configured message-size cap. This issue is fixed in version 1.30.5.","published":"2026-08-20T22:17:57.000Z","lastModified":"2026-10-18T20:10:00.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},"cwe":["CWE-770"],"affected":[],"epss":{"score":0.00507,"percentile":0.4304,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.51%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/axllent/mailpit/commit/8720c6bd8281fc00d458081908f1dbef8e59a98c","source":"security-advisories@github.com"},{"url":"https://github.com/axllent/mailpit/releases/tag/v1.30.5","source":"security-advisories@github.com"},{"url":"https://github.com/axllent/mailpit/security/advisories/GHSA-r553-m4fv-5v97","source":"security-advisories@github.com"},{"url":"https://github.com/axllent/mailpit/security/advisories/GHSA-r553-m4fv-5v97","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-67447","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}