ntop nDPI before 6.0 Heap Buffer Overflow via ndpi_json_string_escape

published 2026-09-04 2mo ago modified 2026-09-23 last mo. also EUVD-2026-71791

cvss: 7.4; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits: 0; none known

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.

Patch / fix

fixed in 1 distros 1 links 1

ntop nDPI 6.0

ntopng Azure Linux 3.0 5.2.1-7

azure linux advisories AZL-99945

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

github.com/ntop/nDPI@94e82c1 commit

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CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: last mo. (2026-09-14)

Exploit prediction

0.59% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by	version	score	vector
CNA	4.0	8.3	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
CNA	3.1	7.4	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
CNA	4.0	8.3	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

ntop nDPI

Classification

Weakness

CWE-787 Out-of-bounds Write

References

github.com /ntop/nDPI/commit/94e82c1de12323d992895830231865736a8abf2c
patch
github.com /ntop/nDPI
product
github.com /ntop/nDPI/blob/5.0/src/lib/ndpi_serializer.c
technical-description
vulncheck.com /advisories/ntop-ndpi-before-6.0-heap-buffer-overflow-via-ndpi-json-string-escape
third-party-advisory

Sources

CVE List CVE-2026-86098
NVD CVE-2026-86098

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