CVE-2026-41319

medium

Published 2026-04-24 · Modified 2026-05-05

💬 Discuss on Community ✚ Propose mitigation

CVSS v3

5.9

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

CVSS v4 NEW

—

not yet in upstream

VIR risk

5.9

Description

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

Predictions

Exploit likelihood

69%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Package impact

Ecosystem	Package	Vulnerable	Fixed
NuGet	MailKit	`<4.16.0`	`4.16.0`

Application impact

Vendor	Product	Versions	Fixed
jstedfast	mailkit	`{"endExcluding":"4.16.0"}`	`4.16.0`

References

CWEs

CWE-74

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.