CVE-2026-31931 PUBLISHED

Suricata tls: null dereference in tls.alpn rule keyword

Assigner: GitHub_M
Reserved: 10.03.2026 Published: 02.04.2026 Updated: 02.04.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 7.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	OISF
Product	suricata
Versions	Version >= 8.0.0, < 8.0.4 is affected

References

https://github.com/OISF/suricata/security/advisories/GHSA-gr22-4784-xvw3
https://redmine.openinfosecfoundation.org/issues/8294

Problem Types

CWE-476: NULL Pointer Dereference CWE