Integer overflow in nfdump - #VU142752
Published: August 15, 2026
Vulnerability identifier: #VU142752
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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 corrupt parser state.
The vulnerability exists due to integer overflow in mplsLabelStack() and readExtendedVlanTunnel() in src/sflow/sflow_process.c when processing a crafted sFlow v5 extended data tag with an oversized depth field. A remote attacker can send a single crafted UDP packet to corrupt parser state.
The issue is reachable through the SFLFLOW_EX_MPLS and SFLFLOW_EX_VLAN_TUNNEL extended data tags.
Affected software
nfdump
Remediation
Install security update from vendor's website.
nfdump - update to 1.7.9