Vulnerability · Published Nov 5, 2026 · Assigned by GitHub_M

CVE-2026-97371ntopng: Stack buffer overflow (write) in nDPI custom category detection allows remote code execution via crafted network packets

Medium 5.3

In plain English

A medium-severity stack buffer overflow in ntopng from ntop. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.5%top 58.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Ubuntu:22.04:LTS	ntopng	no fix listed	UBUNTU-CVE-2026-97371
Ubuntu:24.04:LTS	ntopng	no fix listed	UBUNTU-CVE-2026-97371

Affected products (as reported)

Vendor	Product	Versions
ntop	ntopng	< 6.7.260721

Weakness: CWE-121 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

https://github.com/ntop/ntopng/security/advisories/GHSA-26jm-9qfw-89w7 x_refsource_CONFIRM
https://github.com/ntop/ntopng/commit/96acb6187950a6a49ca827e49973c3e0c27ea664 x_refsource_MISC