#VU121069 Use-after-free in Snort - CVE-2026-20026
Published: January 7, 2026 / Updated: January 29, 2026
Vulnerability identifier: #VU121069
Vulnerability risk: Medium
CVSSv4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-20026
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Snort
Snort
Software vendor:
Sourcefire
Sourcefire
Description
The vulnerability allows a remote attacker to perform a denial of service attack.
The vulnerability exists due to a use-after-free error when processing DCE/RPC requests. A remote non-authenticated attacker can send a large number of DCE/RPC requests through an established connection that is inspected by Snort, trigger a use-after-free read and perform a denial of service attack against the Snort 3 Detection Engine.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
Remediation
Install updates from vendor's website.