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

Collected exploitation and prediction evidence

Risk source coverage

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

CVE-2026-41319

Exact risk observation. Current source statements above are a separate evidence layer. Latest risk evidence.

No KEV entry is attached to this observation; this is not evidence that exploitation is absent.

FIRST EPSS: 0.22 % · percentile 12.80 % · scored 27 Oct 2026. Retained older prediction.

Observed 27 Oct 2026 15:46:19 UTC · Complete immutable risk JSON

Immutable source observations

7 recorded revisions

Each citation identifies one complete source statement. Source modification dates and the time this installation observed them are distinct. Latest history includes records historically associated by source identifiers; a removed alias is not a current equivalence claim. Exact citations show that source record's own earlier observations. Failed reads and unchanged polls do not rewrite history.

1 Nov 2026 07:06:53 UTC

MailKit is a cross-platform mail client library built on top of MimeKit. A STARTTLS Response Injection vulnerability in versions prior to 4.16.0 allows a Man-in-the-Middle attacker to inject arbitrary protocol responses across the plaintext…

euvd · EUVD-2026-25388 · Published

30 Oct 2026 06:50:58 UTC

MailKit is a cross-platform mail client library built on top of MimeKit. A STARTTLS Response Injection vulnerability in versions prior to 4.16.0 allows a Man-in-the-Middle attacker to inject arbitrary protocol responses across the plaintext…

euvd · EUVD-2026-25388 · Published

28 Oct 2026 05:08:01 UTC

MailKit is a cross-platform mail client library built on top of MimeKit. A STARTTLS Response Injection vulnerability in versions prior to 4.16.0 allows a Man-in-the-Middle attacker to inject arbitrary protocol responses across the plaintext…

euvd · EUVD-2026-25388 · Published

27 Oct 2026 10:10:11 UTC

MailKit is a cross-platform mail client library built on top of MimeKit. A STARTTLS Response Injection vulnerability in versions prior to 4.16.0 allows a Man-in-the-Middle attacker to inject arbitrary protocol responses across the plaintext…

nvd · CVE-2026-41319 · Published

25 Oct 2026 09:17:35 UTC

MailKit is a cross-platform mail client library built on top of MimeKit. A STARTTLS Response Injection vulnerability in versions prior to 4.16.0 allows a Man-in-the-Middle attacker to inject arbitrary protocol responses across the plaintext…

nvd · CVE-2026-41319 · Published

23 Oct 2026 16:01:25 UTC

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

osv · GHSA-9j88-vvj5-vhgr · Published

23 Oct 2026 15:48:27 UTC

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

cve-program · CVE-2026-41319 · Published

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 1 Nov 19:21 UTC · 275 of 275 readable · 272 fully read · documentation 469/469 current