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CVE-2026-97371

ntopng: Stack buffer overflow (write) in nDPI custom category detection allows remote code execution via crafted network packets

5.3 Medium

ntopng is a web-based network traffic monitoring application. Prior to 6.7.260721, ndpi_get_custom_category_match writes a four-byte nDPI protocol-category value through a pointer to the two-byte id variable in IpAddress::reloadBlacklist in src/IpAddress.cpp during packet dissection and host initialization. A remote unauthenticated attacker on a monitored network segment can send packets that match custom-category rules, causing stack corruption and denial of service without user interaction. This issue is fixed in version 6.7.260721.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
Low

Exploit likelihood

0.48%Scored on 2026-11-06. The trend appears after a second daily score.

What each source reports

CVE List Score used 5.3

ntopng: Stack buffer overflow (write) in nDPI custom category detection allows remote code execution via crafted network packets

ntopng is a web-based network traffic monitoring application. Prior to 6.7.260721, ndpi_get_custom_category_match writes a four-byte nDPI protocol-category value through a pointer to the two-byte id variable in IpAddress::reloadBlacklist in src/IpAddress.cpp during packet dissection and host initialization. A remote unauthenticated attacker on a monitored network segment can send packets that match custom-category rules, causing stack corruption and denial of service without user interaction. This issue is fixed in version 6.7.260721.

Record
CVE-2026-97371
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-121
Updated
2026-11-05
EUVDEUVD-2026-117570 5.3

ntopng is a web-based network traffic monitoring application. Prior to 6.7.260721, ndpi_get_custom_category_match writes a four-byte nDPI protocol-category value through a pointer to the two-byte id variable in IpAddress::reloadBlacklist in src/IpAddress.cpp during packet dissection and host initialization. A remote unauthenticated attacker on a monitored network segment can send packets that match custom-category rules, causing stack corruption and denial of service without user interaction. This issue is fixed in version 6.7.260721.

Record
EUVD-2026-117570
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-05
NVD 5.3

ntopng is a web-based network traffic monitoring application. Prior to 6.7.260721, ndpi_get_custom_category_match writes a four-byte nDPI protocol-category value through a pointer to the two-byte id variable in IpAddress::reloadBlacklist in src/IpAddress.cpp during packet dissection and host initialization. A remote unauthenticated attacker on a monitored network segment can send packets that match custom-category rules, causing stack corruption and denial of service without user interaction. This issue is fixed in version 6.7.260721.

Record
CVE-2026-97371
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-121
Updated
2026-11-05
OSV 5.3

ntopng: Stack buffer overflow (write) in nDPI custom category detection allows remote code execution via crafted network packets

ntopng is a web-based network traffic monitoring application. Prior to 6.7.260721, ndpi_get_custom_category_match writes a four-byte nDPI protocol-category value through a pointer to the two-byte id variable in IpAddress::reloadBlacklist in src/IpAddress.cpp during packet dissection and host initialization. A remote unauthenticated attacker on a monitored network segment can send packets that match custom-category rules, causing stack corruption and denial of service without user interaction. This issue is fixed in version 6.7.260721.

Record
CVE-2026-97371
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-121
Updated
2026-11-07
OSVUBUNTU-CVE-2026-97371 5.3

ntopng is a web-based network traffic monitoring application. Prior to 6.7.260721, ndpi_get_custom_category_match writes a four-byte nDPI protocol-category value through a pointer to the two-byte id variable in IpAddress::reloadBlacklist in src/IpAddress.cpp during packet dissection and host initialization. A remote unauthenticated attacker on a monitored network segment can send packets that match custom-category rules, causing stack corruption and denial of service without user interaction. This issue is fixed in version 6.7.260721.

Record
UBUNTU-CVE-2026-97371
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-07
OSVAZL-112705 No score

CVE-2026-97371 affecting package ntopng 5.2.1-7

ntopng is a web-based network traffic monitoring application. Prior to 6.7.260721, ndpi_get_custom_category_match writes a four-byte nDPI protocol-category value through a pointer to the two-byte id variable in IpAddress::reloadBlacklist in src/IpAddress.cpp during packet dissection and host initialization. A remote unauthenticated attacker on a monitored network segment can send packets that match custom-category rules, causing stack corruption and denial of service without user interaction. This issue is fixed in version 6.7.260721.

Record
AZL-112705
Updated
2026-11-06

Affected products

Affected packages

Affected packages
PackageAffectedFixed
ntopng
Azure Linux:3
through 5.2.1-7 None known
ntopng
Ubuntu:Pro:16.04:LTS
All versions, plus listed versions
1.2.1+dfsg1-2ubuntu12.0+dfsg1-12.2+dfsg1-12.2+dfsg1-1build12.2+dfsg1-1ubuntu0.1~esm2
None known
ntopng
Ubuntu:Pro:18.04:LTS
All versions, plus listed versions
2.4+dfsg1-32.4+dfsg1-43.2+dfsg1-13.2+dfsg1-1ubuntu0.1~esm2
None known
ntopng
Ubuntu:20.04:LTS
All versions, plus listed versions
3.8+dfsg1-2.1build3
None known
ntopng
Ubuntu:22.04:LTS
All versions, plus listed versions
5.2.1+dfsg1-1
None known
ntopng
Ubuntu:24.04:LTS
All versions, plus listed versions
5.2.1+dfsg1-15.2.1+dfsg1-1ubuntu15.2.1+dfsg1-1ubuntu35.2.1+dfsg1-1ubuntu4
None known

History

History
RecordedChangedSources
affected, aliases, referencesOSV
affected, aliases, referencesEUVD, NVD, OSV
aliases, referencesOSV
referencesCVE List, NVD
aliases, publishedEUVD
first indexedCVE List

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

In short

CVE-2026-97371 is a medium vulnerability (CVSS 5.3) in Ntop Ntopng, published November 5, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.48%, the 41st percentile. No source names a fixed version.

References

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