What is CVE-2026-31931?

CVE-2026-31931 is a high-severity vulnerability in Oisf Suricata, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-04-02.

How severe is CVE-2026-31931?

High severity. CVSS v3 base score is 7.5 out of 10.

NULL pointer dereference in Oisf Suricata

CVE-2026-31931

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.

EPSS: 0.004 (27.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Oisf Suricata — versions >= 8.0.0, < 8.0.4

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (Permissions Required, x_refsource_MISC, Issue Tracking)

Frequently asked questions

What is CVE-2026-31931?: CVE-2026-31931 is a high-severity vulnerability in Oisf Suricata, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-04-02.
How severe is CVE-2026-31931?: High severity. CVSS v3 base score is 7.5 out of 10.