CVE-2026-40107
SiYuan Mermaid.js flaw leaks NTLMv2 hash on Windows via crafted diagram.
Is CVE-2026-40107 being exploited?
Not confirmed. CVE-2026-40107 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.31% probability of exploitation in the next 30 days.
How severe is CVE-2026-40107?
CVE-2026-40107 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-40107?
Yes. A fix has been recorded for CVE-2026-40107. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-40107 affect?
CVE-2026-40107 affects SiYuan desktop (pre-3.6.4), Windows SMB/NTLM flow. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-40107?
Upgrade to 3.6.4+ for fix
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
NTLMv2 hash leakage via UNC path SMB auth; attacker may steal credentials and enable lateral movement.
Patch when possible
- affected< 3.6.4
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.