Out-of-bounds Read in Ntop Ndpi
CVE-2026-116744
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/ntop/nDPI/pull/3298 (issue-tracking, patch)
- github.com/ntop/nDPI/commit/ca9d819151606377ac53305583fe819748c69be2 (patch)
- github.com/ntop/nDPI (product)
- github.com/ntop/nDPI/blob/6.0/src/lib/protocols/softether.c (technical-description)
- hackmd.io/@haindpwn/ndpi-softether-host-fqdn-strncmp-oob-read (third-party-advisory)
- github.com/ntop/nDPI/issues/3291 (issue-tracking)
- www.vulncheck.com/advisories/ntop-ndpi-through-6.0-out-of-bounds-read-in-softet… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-116744?
- CVE-2026-116744 is a medium-severity vulnerability in Ntop Ndpi, classified under Out-of-bounds Read. CVSS score: 5.3/10. Published 2026-10-26.
- How severe is CVE-2026-116744?
- Medium severity. CVSS v3 base score is 5.3 out of 10.