Mailpit: SMTP command parser buffers unbounded command lines before syntax rejection

Date Sep 2, 2026
Type Vendor advisory
Signal High-risk advisory
Vendor / Product Go ยท github.com/axllent/mailpit
CVE CVE-2026-67445
High-risk advisory CVE-2026-67445

Summary

Mailpit: SMTP command parser buffers unbounded command lines before syntax rejection

Why it matters

GitHub has published a reviewed security advisory for github.com/axllent/mailpit. Prioritize it with other application dependency updates, especially because EPSS places it in the 30% percentile.

Operator check

Check whether github.com/axllent/mailpit is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. EPSS probability: 0.4%; percentile: 30%.

Sources

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.