CVE-2026-41319 — Versions Prior To Vulnerability

/MEDIUM /CVSS 6.5/10
Written by SCW Vulnerability Desk Vulnerability Intelligence
National Vulnerability Database vulnerabilitycvemedium-severitycwe-74
CVE-2026-41319 — Versions Prior To Vulnerability

CVE-2026-41319 — 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-to-TLS trust boundary, enabling SASL authe

What This Means For You

  • If your environment is affected by CWE-74, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-41319 updates and patches.
🛡️ Am I exposed to this? Get detection rules for CVE-2026-41319 — Splunk, Sentinel, Elastic, QRadar & more →

Related ATT&CK Techniques

T1571 Non-Standard Port Command and Control T1071.004 DNS Command and Control T1190 Exploit Public-Facing Application Initial Access

🛡️ Detection Rules

2 rules · 6 SIEM formats

2 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.

critical T1190 Initial Access

Potential STARTTLS Response Injection via MailKit - CVE-2026-41319

Sigma YAML — free preview
✓ Sigma · Splunk SPL Sentinel KQL Elastic QRadar AQL Wazuh Get rules for your SIEM →

Indicators of Compromise

IDTypeIndicator
CVE-2026-41319 vulnerability CVE-2026-41319
CWE-74 weakness CWE-74

Written by SCW Vulnerability Desk

Source & Attribution
Source PlatformNVD
ChannelNational Vulnerability Database
PublishedApril 24, 2026 at 07:16 UTC

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