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CVE-2026-86098

ntop nDPI before 6.0 Heap Buffer Overflow via ndpi_json_string_escape

8.3 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
High
Availability
High

Exploit likelihood

0.59%Up 0.2 points since Sep 5, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.3

ntop nDPI before 6.0 Heap Buffer Overflow via ndpi_json_string_escape

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.

Record
CVE-2026-86098
CVSS 4.0
8.3 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
Weakness
CWE-787
Updated
2026-11-02
EUVDEUVD-2026-71791 8.3

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.

Record
EUVD-2026-71791
CVSS 4.0
8.3 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-c8vx-3h2j-4f8m 8.3

ntop nDPI versions before 6.0 contain a heap buffer overflow vulnerability in the...

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.

Record
GHSA-c8vx-3h2j-4f8m
CVSS 4.0
8.3 HighCVSS: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
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
Weakness
CWE-787
Updated
2026-11-02
NVD 8.3

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.

Record
CVE-2026-86098
CVSS 4.0
8.3 HighCVSS: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
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
Weakness
CWE-787
Updated
2026-11-02
OSV 8.3

ntop nDPI before 6.0 Heap Buffer Overflow via ndpi_json_string_escape

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.

Record
CVE-2026-86098
CVSS 4.0
8.3 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-787
Updated
2026-11-02
OSVDEBIAN-CVE-2026-86098 8.3

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.

Record
DEBIAN-CVE-2026-86098
CVSS 4.0
8.3 HighCVSS: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
Updated
2026-11-02
OSVUBUNTU-CVE-2026-86098 8.3

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.

Record
UBUNTU-CVE-2026-86098
CVSS 4.0
8.3 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
Updated
2026-11-02
OSVAZL-99945 No score

CVE-2026-86098 affecting package ntopng for versions less than 5.2.1-7

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.

Record
AZL-99945
Updated
2026-11-05

Affected products

Affected packages

Affected packages
PackageAffectedFixed
ntopng
Azure Linux:3
 before 5.2.1-7
5.2.1-7
ndpi
Debian:12
 All versions, plus listed versions
4.2-24.2-2.14.2-2.1~exp1
 None known
ndpi
Debian:13
 All versions, plus listed versions
4.2-2.1
 None known
ndpi
Debian:14
 All versions, plus listed versions
4.2-2.1
 None known
ndpi
Ubuntu:16.04:LTS
 All versions, plus listed versions
1.5.0-11.6-11.7.1~git20151130.6f3d5a7-1
 None known
ndpi
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.8-12.2-1
 None known
ndpi
Ubuntu:20.04:LTS
 All versions, plus listed versions
2.6-42.6-5
 None known
ndpi
Ubuntu:22.04:LTS
 All versions, plus listed versions
4.0-44.2-2
 None known
ndpi
Ubuntu:24.04:LTS
 All versions, plus listed versions
4.2-24.2-2.14.2-2.1build1
 None known
ndpi
Ubuntu:26.10
 All versions, plus listed versions
4.2-2.1build2
 None known
ndpi
Ubuntu:26.04:LTS
 All versions, plus listed versions
4.2-2.1build14.2-2.1build2
 None known

History

History
RecordedChangedSources
factsOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-86098 is a high vulnerability (CVSS 8.3) in Ntop Ndpi, published September 4, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.59%, the 48th percentile. Fixed in ntopng 5.2.1-7.

References

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