{"id":"CVE-2026-67445","sourceIdentifier":"security-advisories@github.com","published":"2026-08-20T21:17:07.110","lastModified":"2026-10-18T20:10:00.110","vulnStatus":"Deferred","cveTags":[],"descriptions":[{"lang":"en","value":"Mailpit is an email testing tool and API for developers. Prior to 1.30.4, Mailpit reads SMTP commands through internal/smtpd/smtpd.go session.readLine() using bufio.Reader.ReadString before session.parseLine() parses the verb or the RFC 5321 512-octet command-line limit is enforced. An unauthenticated remote SMTP client can send an oversized single command line that is fully allocated before syntax rejection or timeout, and the normal MaxMessageSize and DATA limits do not apply to this pre-DATA path. The same command reader is used by handleAuthLogin(), handleAuthPlain(), and handleAuthCramMD5() continuation lines, so concurrent oversized inputs can create memory pressure and reduce service availability. This issue is fixed in version 1.30.4."},{"lang":"es","value":"Mailpit es una herramienta de prueba de correo electrónico y API para desarrolladores. Antes de la versión 1.30.4, Mailpit lee comandos SMTP a través de internal/smtpd/smtpd.go session.readLine() utilizando bufio.Reader.ReadString antes de que session.parseLine() analice el verbo o se aplique el límite de línea de comando de 512 octetos de RFC 5321. Un cliente SMTP remoto no autenticado puede enviar una única línea de comando de tamaño excesivo que se asigna completamente antes del rechazo de sintaxis o el tiempo de espera, y los límites normales de MaxMessageSize y DATA no se aplican a esta ruta pre-DATA. El mismo lector de comandos es utilizado por las líneas de continuación de handleAuthLogin(), handleAuthPlain() y handleAuthCramMD5(), por lo que las entradas concurrentes de tamaño excesivo pueden crear presión en la memoria y reducir la disponibilidad del servicio. Este problema se soluciona en la versión 1.30.4."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"axllent","product":"mailpit","versions":[{"version":"< 1.30.4","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"LOW"},"exploitabilityScore":3.9,"impactScore":1.4}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-08-21T21:09:33.233187Z","id":"CVE-2026-67445","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-400"}]}],"references":[{"url":"https://github.com/axllent/mailpit/commit/993bed95b3c74d95231af93bd0e0d4c3d5b4db4d","source":"security-advisories@github.com"},{"url":"https://github.com/axllent/mailpit/releases/tag/v1.30.4","source":"security-advisories@github.com"},{"url":"https://github.com/axllent/mailpit/security/advisories/GHSA-w878-pj84-3j5v","source":"security-advisories@github.com"}]}