Integer overflow in nfdump - #VU142758
Published: August 15, 2026
Vulnerability identifier: #VU142758
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-190
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 integer overflow in the readExtendedGateway_v2() parser in src/sflow/sflow_process.c when parsing a crafted sFlow v2 extended gateway UDP packet. A remote attacker can send a single crafted UDP packet to cause a denial of service.
The issue occurs because a wire-controlled dst_as_path_len value is multiplied by 4 without overflow checking, leading to out-of-bounds array indexing and a crash. The sFlow protocol has no authentication.
Affected software
nfdump
Remediation
Install security update from vendor's website.
nfdump - update to 1.7.9