Use-after-free in nfdump - #VU142738
Published: August 15, 2026
Vulnerability identifier: #VU142738
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-416
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 use-after-free in the nfcapd IPFIX template withdrawal handling when processing a valid withdraw-all IPFIX message after a template has been installed for the same exporter and observation domain. A remote attacker can send specially crafted UDP/IPFIX datagrams to cause a denial of service.
The issue is triggered by two unauthenticated datagrams from an accepted exporter: one to install a data template and one withdraw-all message for the same source IP and observation domain.
Affected software
nfdump
Remediation
Install security update from vendor's website.
nfdump - update to 1.7.9