Infinite loop in nfdump - #VU142739
Published: August 15, 2026
Vulnerability identifier: #VU142739
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-835
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 loop with unreachable exit condition in Process_ipfix_data() when processing IPFIX data records that reference a template containing a zero-length fixed-length field. A remote attacker can send a crafted IPFIX template followed by a data record to cause a denial of service.
A single follow-up data datagram can sustain the condition indefinitely without further network traffic, leading to CPU exhaustion and unbounded output-file growth.
Affected software
nfdump
Remediation
Install security update from vendor's website.
nfdump - update to 1.7.9