Infinite loop in Snort - CVE-2026-76445
Published: October 21, 2026
Vulnerability identifier: #VU156722
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-76445
CWE-ID: CWE-835
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service in the Snort 3 Detection Engine.
The vulnerability exists due to a logic error in the Snort 3 GTP codec when processing General Packet Radio Service (GPRS) Tunneling Protocol (GTP) extension headers. A remote attacker can send a crafted, fragmented UDP datagram containing these headers to trigger an infinite loop and cause a denial of service.
On Cisco Secure Firewall Threat Defense devices, Snort 3 must be active for exploitation.
Affected software
Snort
How to mitigate CVE-2026-76445
Install security update from vendor's website.
Snort - update to 3.12.4.0