{"apiVersion":"1.0","identifier":"CVE-2026-67447","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.","publishedAt":"2026-08-20T22:17:56","lastModifiedAt":"2026-08-21T17:16:41","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-67447","cvssScore":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","epssProbability":0.00372,"riskScore":0.55,"affectedProduct":"Mailpit","affectedVersions":">=1.30.0,<1.30.5","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-67447","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-67447","en":"https://www.redsauce.net/en/cves/CVE-2026-67447","fr":"https://www.redsauce.net/fr/cves/CVE-2026-67447","pt":"https://www.redsauce.net/pt/cves/CVE-2026-67447","de":"https://www.redsauce.net/de/cves/CVE-2026-67447","sk":"https://www.redsauce.net/sk/cves/CVE-2026-67447","el":"https://www.redsauce.net/el/cves/CVE-2026-67447"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-67447"}}