TI-2026-24477 Aliases CVE-2026-31931

Suricata tls: null dereference in tls.alpn rule keyword

LOW 39CWE-476Published 2026-04-02 · Updated 2026-04-02

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-476.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00365 30th percentileScored 2026-11-07

Fix Fixed suricata (OISF): 8.0.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
OISF	suricata	8.0.0 to before 8.0.4	8.0.4	Patch available	CNA

suricata VendorOISF Affected 8.0.0 to before 8.0.4 Fixed in 8.0.4 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:oisf:suricata::::::::	8.0.0 to before 8.0.4	Vulnerable	OISF

cpe:2.3:a:oisf:suricata:*:*:*:*:*:*:*:* Versions 8.0.0 to before 8.0.4 Vulnerable ·OISF

Remediation

Fix · CNA suricata (OISF) Fixed in 8.0.4

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2026-31931

References

Advisory 1

https://github.com/OISF/suricata/security/advisories/GHSA-gr22-4784-xvw3

Other 1

https://redmine.openinfosecfoundation.org/issues/8294

TI-2026-33506 ikev2: unbounded client transform storage can lead to resource exhaustion CVSS 3.1HIGH 7.5
TI-2026-33484 Suricata lua/tls: null dereference in TlsGetCertInfo CVSS 3.1HIGH 7.5
TI-2024-31811 Suricata ja4: invalid alpn leads to panic CVSS 3.1HIGH 7.5
TI-2020-13673 Directory Traversal vulnerability found in Pfsense v.2.1.3 and Pfsense Suricata v.1.4.6… CVSS 3.1HIGH 7.5
TI-2023-17928 In Suricata before 6.0.13, an adversary who controls an external source of Lua rules may… CVSS 3.1CRITICAL 9.8
TI-2026-63304 Use after free in OISF Suricata CVSS 3.1CRITICAL 9.4

See all 99 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences