Buffer overflow in Ntop Ndpi
CVE-2026-86098
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/ntop/nDPI (product)
- github.com/ntop/nDPI/blob/5.0/src/lib/ndpi_serializer.c (technical-description)
- github.com/ntop/nDPI/commit/94e82c1de12323d992895830231865736a8abf2c (patch)
- www.vulncheck.com/advisories/ntop-ndpi-before-6.0-heap-buffer-overflow-via-ndpi… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-86098?
- CVE-2026-86098 is a high-severity vulnerability in Ntop Ndpi, classified under Out-of-bounds Write. CVSS score: 7.4/10. Published 2026-09-04.
- How severe is CVE-2026-86098?
- High severity. CVSS v3 base score is 7.4 out of 10.