ZDI-26-046: Cisco Snort _bnfa_search_csparse_nfa Use-After-Free Remote Code Execution Vulnerability
Published Jan 28, 2026
·Updated
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Cisco Snort. Authentication is not required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 9.8. The following CVEs are assigned: CVE-2026-20026.
Affected Software
1 affected component
Cisco Snort
Event History
Jan 28, 2026
Advisory Published
via ZDI·06:00 AM
Data Sourced
via ZDI·06:00 AM
Description
Frequently Asked Questions
1
What is the severity of ZDI-26-046?
ZDI-26-046 has been assigned a CVSS rating of 9, indicating a high severity level.
2
How do I fix ZDI-26-046?
To mitigate ZDI-26-046, update your Cisco Snort installation to the latest available version that addresses this vulnerability.
3
What type of vulnerability is ZDI-26-046?
ZDI-26-046 is a use-after-free vulnerability that allows remote code execution.
4
Is authentication required to exploit ZDI-26-046?
No, authentication is not required to exploit ZDI-26-046.
5
What products are affected by ZDI-26-046?
ZDI-26-046 affects installations of Cisco Snort.