Out-of-bounds read in nfdump - #VU142756
Published: August 15, 2026
Vulnerability identifier: #VU142756
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 out-of-bounds read in the MPLS label stack parser in decodeLinkLayer() when parsing crafted sFlow data. A remote attacker can send specially crafted sFlow input to cause a denial of service.
After VLAN tag peeling, the parser may reach MPLS processing with insufficient remaining bytes, and a dereference past the end of the buffer may trigger a SIGSEGV when determining the inner protocol type.
Affected software
nfdump
Remediation
Install security update from vendor's website.
nfdump - update to 1.7.9