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Advisory record · GHSA-g7hc-96xr-gvvx

MimeKit has CRLF Injection in Quoted Local-Part that Enables SMTP Command Injection and Email Forgery

CVSS 6.9 MediumEPSS 0.012 · 68th percentile

Published by the GitHub Advisory Database at 5 Mar 2026, 21:50 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
MimeKitNuGet<4.15.14.15.1
Identifiers
GHSA-g7hc-96xr-gvvx · CVE-2026-30227
Weakness (CWE)
CWE-93
Tags
Published
5 Mar 2026
Updated
6 Mar 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

MimeKit versions before 4.15.1 accept carriage return and line feed characters inside a quoted local-part of an email address, which RFC 5321 does not permit. An attacker who can influence a sender or recipient address that the application passes to MailKit's SMTP client could inject extra SMTP commands or forge mail headers, depending on how the application builds messages. Upgrade MimeKit to 4.15.1 or later.

Written 9 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.9 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.012, the 68th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:22 UTC First seen by agentprime
  2. 31 Oct 2026, 15:22 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.