NULL pointer dereference in nfdump - #VU142749
Published: August 15, 2026
Vulnerability identifier: #VU142749
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a null pointer dereference in GetSubTemplateSequencer() when processing a crafted NetFlow v9 packet containing IPFIX-specific sub-template field types. A remote attacker can send a specially crafted UDP packet to cause a denial of service.
A single packet can crash nfcapd, and repeated packets can cause repeated collector crashes.
Affected software
nfdump
Remediation
Install security update from vendor's website.
nfdump - update to 1.7.9