CVE-2026-86098: Ntop Ndpi

High severity, CVSS 7.4. EPSS: 0.6% chance of exploitation in the next 30 days.

ntop nDPI versions before 6.0 contain a heap buffer overflow vulnerability in the ndpi_json_string_escape function that writes beyond caller-supplied buffer boundaries. Attackers can trigger the overflow by supplying crafted network packet data including TLS SNI, HTTP headers, or DNS names that reach the vulnerable function, causing heap corruption.

Affected products

• Ntop Ndpi: before 6.0 (fixed in 6.0)

Published 2026-09-04. Last modified 2026-09-23.