CVE-2026-76489

Multiple Cisco products are affected by a vulnerability in the memory management implementation of Snort 3 that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to incomplete error checking when Snort 3 processes files, which could cause unreleased memory. An attacker could exploit this vulnerability by sending a large number of files to be processed. A successful exploit could allow the attacker to cause the Snort 3 Detection Engine to restart unexpectedly, resulting in a DoS condition.

Score

CVSS 3.1 5.8 Medium

Status

Awaiting Analysis - psirt@cisco.com

Published

2026-10-21

Last modified

2026-10-22

Weaknesses

CWE-401

Affected products

• Cisco Open Source Snort3 (Cisco)
• Cisco Secure Firewall Threat Defense Ftd Software (Cisco)

References

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-misc-dos-6mB22qAK