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A memory management vulnerability in Cisco Open Source Snort3 allows an unauthenticated remote attacker to cause the Snort 3 Detection Engine to restart, resulting in a denial of service (DoS). The issue arises from incomplete error checking when processing files, leading to unreleased memory. Exploitation requires sending a large number of files to trigger the condition.

CVE-2026-76489 affects multiple Cisco products using Snort 3 due to a flaw in memory management. Specifically, incomplete error checking during file processing can cause memory to remain unreleased. An attacker can exploit this by sending numerous files to Snort 3, causing the detection engine to restart unexpectedly and interrupt packet inspection. This results in a denial of service condition. The vulnerability has a CVSS 3.1 score of 5.8, indicating medium severity.

A memory management vulnerability in Cisco Open Source Snort3 allows an unauthenticated remote attacker to cause the Snort 3 Detection Engine to restart, resulting in a denial of service (DoS). The issue arises from incomplete error checking when processing files, leading to unreleased memory. Explo

CVE-2026-76489: Missing Release of Memory after Effective Lifetime in Cisco Cisco Open Source Snort3

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