CVE-2026-31931: Oisf Suricata

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Suricata is a network IDS, IPS and NSM engine. From version 8.0.0 to before version 8.0.4, use of the "tls.alpn" rule keyword can cause Suricata to crash with a NULL dereference. This issue has been patched in version 8.0.4.

Affected products

• Oisf Suricata: from 8.0.0, before 8.0.4 (fixed in 8.0.4)

Published 2026-04-02. Last modified 2026-06-17.