{"cve":"CVE-2026-67447","nvd":{"published":"2026-08-20T22:17:56.720","modified":"2026-10-18T20:10:00.110","status":"Deferred","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.","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-770"],"references":["https://github.com/axllent/mailpit/commit/8720c6bd8281fc00d458081908f1dbef8e59a98c","https://github.com/axllent/mailpit/releases/tag/v1.30.5","https://github.com/axllent/mailpit/security/advisories/GHSA-r553-m4fv-5v97","https://github.com/axllent/mailpit/security/advisories/GHSA-r553-m4fv-5v97"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:49:38.260478770+00:00"},"epss":{"cve":"CVE-2026-67447","score":0.00507,"percentile":0.42959,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-r553-m4fv-5v97","url":"https://osv.dev/vulnerability/GHSA-r553-m4fv-5v97","summary":"Mailpit: SMTP DATA line reader buffers over-limit input before size enforcement","modified":"2026-09-02T23:45:04.656426563Z","packages":[{"ecosystem":"Go","name":"github.com/axllent/mailpit","purl":"pkg:golang/github.com/axllent/mailpit","ranges":[">=1.30.0 <1.30.5"],"fixed":["1.30.5"]}]},{"id":"GO-2026-6272","url":"https://osv.dev/vulnerability/GO-2026-6272","summary":"Mailpit: SMTP DATA line reader buffers over-limit input before size enforcement in github.com/axllent/mailpit","modified":"2026-08-26T01:21:40.611175898Z","packages":[{"ecosystem":"Go","name":"github.com/axllent/mailpit","purl":"pkg:golang/github.com/axllent/mailpit","ranges":[">=1.30.0 <1.30.5"],"fixed":["1.30.5"]}]}],"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."]}