CVE-2026-85440
Pre-auth heap overflow in MOOSCommPkt allows remote arbitrary write.
Is CVE-2026-85440 being exploited?
Not confirmed. CVE-2026-85440 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 0.55% probability of exploitation in the next 30 days.
How severe is CVE-2026-85440?
CVE-2026-85440 is rated Critical. 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-2026-85440?
Yes. A fix has been recorded for CVE-2026-85440. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-85440 affect?
CVE-2026-85440 affects core-moos <= 10.4.0, libMOOS (MOOSCommPkt), MOOSDB. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-85440?
Upgrade core-moos to the patched commit/release; restrict MOOS network access.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Pre-auth remote heap overflow via negative packet length enables arbitrary memory write and likely remote code execution during handshake.
Immediate action required
- affected<= 10.4.0
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.