CVE-2026-86098 ntop CVE debrief

Who should care

Defenders responsible for network security, particularly those using ntop nDPI, should assess exposure and prioritize patching or upgrading to version 6.0 or later. This includes network administrators, security teams, and IT personnel responsible for maintaining and securing network infrastructure. Additionally, operators of systems that rely on ntop nDPI for network monitoring and analysis should also be aware of this vulnerability and take necessary 6

Why it matters

CVE-2026-86098 is a high-severity heap buffer overflow vulnerability in ntop nDPI versions before 6.0, allowing attackers to trigger heap corruption. Defenders should prioritize patching or upgrading to version 6.0 or later, monitor network traffic, and verify inventory of affected systems.

• Potential for heap corruption and system instability
• Possible disruption of network services
• Need for patching or upgrading to version 6.0 or later
• Verification of inventory and patching of affected systems

Technical summary

The ndpi_json_string_escape function in ntop nDPI versions before 6.0 is vulnerable to a heap buffer overflow. Attackers can trigger the overflow by supplying crafted network packet data, including TLS SNI, HTTP headers, or DNS names, causing heap corruption. This vulnerability has a CVSS score of 8.3 and is classified as HIGH severity. The vulnerability affects ntop nDPI versions before 6.0, and defenders should prioritize patching or upgrading to version 6.0 or later. The vulnerability can be triggered by crafted network packet data, and defenders should monitor network traffic for potential attacks.

Defensive priority

Defenders should prioritize patching or upgrading to version 6.0 or later of ntop nDPI, as the vulnerability can be triggered by crafted network packet data.

Recommended defensive actions

• Patch or upgrade to version 6.0 or later of ntop nDPI
• Monitor network traffic for crafted packets that could trigger the vulnerability
• Verify inventory of affected systems and prioritize patching
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability is confirmed by the CVE Program and NVD, with details provided in the official CVE record and NVD vulnerability detail pages. Evidence is limited to public sources and may not reflect the full scope of affected systems or potential impacts. Defenders should verify inventory of affected ntop nDPI versions before 6.0 and prioritize patching or upgrading to version 6.0 or later.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.