Out-of-bounds read in nfdump - #VU142751
Published: August 15, 2026
Vulnerability identifier: #VU142751
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-125
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 an out-of-bounds read in the sFlow parser getData32_nobswap() read function when parsing sFlow datagrams. A remote attacker can send a specially crafted sFlow packet that reaches the end of the buffer to cause a denial of service.
The issue occurs because the buffer pointer is dereferenced before bounds are checked, and a crash may occur if the read crosses a page boundary into unmapped memory.
Affected software
nfdump
Remediation
Install security update from vendor's website.
nfdump - update to 1.7.9