CVE-2026-97371
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.
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
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 Medium
CVSS: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 Medium
CVSS: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 Medium
CVSS: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 Medium
CVSS: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 Medium
CVSS: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
| Package | Affected | Fixed |
|---|---|---|
ntopngAzure Linux:3 |
through 5.2.1-7 | None known |
ntopngUbuntu: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 |
ntopngUbuntu: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 |
ntopngUbuntu:20.04:LTS |
All versions, plus listed versions 3.8+dfsg1-2.1build3 |
None known |
ntopngUbuntu:22.04:LTS |
All versions, plus listed versions 5.2.1+dfsg1-1 |
None known |
ntopngUbuntu: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
| Recorded | Changed | Sources |
|---|---|---|
| affected, aliases, references | OSV | |
| affected, aliases, references | EUVD, NVD, OSV | |
| aliases, references | OSV | |
| references | CVE List, NVD | |
| aliases, published | EUVD | |
| first indexed | CVE 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
github.com/ntop/ntopng/security/advisories/GHSA-26jm-9qfw-89w7
github.com/ntop/ntopng/commit/96acb6187950a6a49ca827e49973c3e0c27ea664
nvd.nist.gov/vuln/detail/CVE-2026-97371
github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97371.json
ubuntu.com/security/CVE-2026-97371
cve.org/CVERecord?id=CVE-2026-97371