{"cve":"CVE-2026-67445","nvd":{"published":"2026-08-20T21:17:07.110","modified":"2026-10-18T20:10:00.110","status":"Deferred","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3},"cwes":["CWE-400"],"references":["https://github.com/axllent/mailpit/commit/993bed95b3c74d95231af93bd0e0d4c3d5b4db4d","https://github.com/axllent/mailpit/releases/tag/v1.30.4","https://github.com/axllent/mailpit/security/advisories/GHSA-w878-pj84-3j5v"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:49:38.260478770+00:00"},"epss":{"cve":"CVE-2026-67445","score":0.00507,"percentile":0.42954,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-w878-pj84-3j5v","url":"https://osv.dev/vulnerability/GHSA-w878-pj84-3j5v","summary":"Mailpit: SMTP command parser buffers unbounded command lines before syntax rejection","modified":"2026-09-10T15:25:27.089484566Z","packages":[{"ecosystem":"Go","name":"github.com/axllent/mailpit","purl":"pkg:golang/github.com/axllent/mailpit","ranges":["<1.30.4"],"fixed":["1.30.4"]}]},{"id":"GO-2026-6363","url":"https://osv.dev/vulnerability/GO-2026-6363","summary":"Mailpit: SMTP command parser buffers unbounded command lines before syntax rejection in github.com/axllent/mailpit","modified":"2026-09-10T15:15:14.051286790Z","packages":[{"ecosystem":"Go","name":"github.com/axllent/mailpit","purl":"pkg:golang/github.com/axllent/mailpit","ranges":["<1.30.4"],"fixed":["1.30.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}