Vulnerability · Published Oct 26, 2026 · Assigned by VulnCheck

CVE-2026-116744ntop nDPI through 6.0 Out-of-Bounds Read in SoftEther Dissector

Medium 5.3

In plain English

A medium-severity out-of-bounds read in nDPI from ntop. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.4%top 62.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

ntop nDPI through 6.0 contains an out-of-bounds read vulnerability in dissect_softether_host_fqdn() in softether.c that compares host_name using the consumed byte count instead of data length. Remote attackers can send crafted short UDP datagrams on already-classified SoftEther flows, causing strncmp to read beyond the packet payload buffer.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	ndpi	no fix listed	DEBIAN-CVE-2026-116744
Debian:13	ndpi	no fix listed	DEBIAN-CVE-2026-116744
Debian:14	ndpi	no fix listed	DEBIAN-CVE-2026-116744
Ubuntu:22.04:LTS	ndpi	no fix listed	UBUNTU-CVE-2026-116744
Ubuntu:24.04:LTS	ndpi	no fix listed	UBUNTU-CVE-2026-116744
Ubuntu:26.04:LTS	ndpi	no fix listed	UBUNTU-CVE-2026-116744
Ubuntu:26.10	ndpi	no fix listed	UBUNTU-CVE-2026-116744

Affected products (as reported)

Vendor	Product	Versions
ntop	nDPI	0 – through 6.0

Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

Pull Request #3298 issue-tracking, patch
Patch Commit patch
https://github.com/ntop/nDPI product
https://github.com/ntop/nDPI/blob/6.0/src/lib/protocols/softether.c#L203 technical-description
https://hackmd.io/@haindpwn/ndpi-softether-host-fqdn-strncmp-oob-read third-party-advisory
https://github.com/ntop/nDPI/issues/3291 issue-tracking
VulnCheck Advisory: ntop nDPI through 6.0 Out-of-Bounds Read in SoftEther Dissector third-party-advisory