CVE-2026-116744: ntop nDPI out-of-bounds read in SoftEther dissector

CVE-2026-116744 · Severity: medium · CVSS 5.3 · Published 2026-10-26

ntop nDPI is a deep packet inspection library used to analyze network traffic. A flaw in how it processes SoftEther VPN protocol packets can allow an attacker to send specially crafted datagrams that cause the software to read beyond its packet buffer, potentially exposing memory or crashing network monitoring systems.

Technologies: Ntop nDPI. Vendors: Ntop.

Quick answers

Is CVE-2026-116744 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-116744 being exploited in the wild.
How severe is CVE-2026-116744?
Medium severity, with a CVSS score of 5.3, published 26 October 2026.
Which products and versions are affected?
Ntop nDPI through 6.0.
Is there a fix for CVE-2026-116744?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-116744 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-116744?
Check whether you run Ntop nDPI at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The dissect_softether_host_fqdn() function in softether.c uses a consumed byte count instead of the actual data length when validating the host_name field, leading to an out-of-bounds read when strncmp() attempts to compare data beyond the packet payload. Remote attackers can exploit this by sending malformed short UDP datagrams on already-classified SoftEther flows to trigger the vulnerability with no authentication required.

Affected products

  • ntop nDPI through 6.0

Timeline

  • 2026-10-26: disclosed

References

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