Is MailKit affected by CVE-2026-41319?

NuGet MailKit is affected in <4.16.0.

Is CVE-2026-41319 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

medium

CVE-2026-41319

Q: Is CVE-2026-41319 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

NuGet · MailKit

Summary

MailKit has STARTTLS Response Injection via unflushed stream buffer that enables SASL mechanism downgrade

Severity: medium
EPSS: 0.2% (p13)
Also known as: GHSA-9j88-vvj5-vhgr
Published: 2026-04-18

References

https://github.com/jstedfast/MailKit/security/advisories/GHSA-9j88-vvj5-vhgr
https://nvd.nist.gov/vuln/detail/CVE-2026-41319
https://github.com/jstedfast/MailKit

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.