ZDI-CAN-27892: 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-CAN-27892?
The severity of ZDI-CAN-27892 is critical, as it allows remote code execution without authentication.
2
How do I fix ZDI-CAN-27892?
To fix ZDI-CAN-27892, update your Cisco Snort installation to the latest version where the vulnerability has been patched.
3
What are the potential impacts of ZDI-CAN-27892?
The potential impacts of ZDI-CAN-27892 include unauthorized remote code execution, data loss, and system compromise.
4
Is authentication required to exploit ZDI-CAN-27892?
No, authentication is not required to exploit ZDI-CAN-27892, making it particularly dangerous.
5
Which software is affected by ZDI-CAN-27892?
ZDI-CAN-27892 affects Cisco Snort installations.