Infinite loop in nfdump - #VU142741
Published: August 15, 2026
Vulnerability identifier: #VU142741
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 ProcessSubTemplate() in src/libnffile/nfxV3.c when processing IPFIX subTemplateMultiList data with a zero-size subTemplateSize entry. A remote attacker can send two specially crafted UDP datagrams to cause a denial of service.
The issue causes CPU exhaustion without memory corruption, a crash, or disk exhaustion.
Affected software
nfdump
Remediation
Install security update from vendor's website.
nfdump - update to 1.7.9