How severe is CVE-2026-31931?

CVE-2026-31931 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-31931 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-31931?

CVE-2026-31931 affects Oisf Suricata. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-31931?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-31931 have an EU (EUVD) identifier?

Yes. CVE-2026-31931 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18237.

When was CVE-2026-31931 published?

CVE-2026-31931 was published on 2026-04-02 and last updated on 2026-06-17.

CVE-2026-31931

CVE-2026-31931 is a high-severity vulnerability in Oisf Suricata with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18237
Weakness: CWE-476
Affected product: Oisf Suricata
Published: 2026-04-02
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-31931?: CVE-2026-31931 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-31931 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-31931?: CVE-2026-31931 affects Oisf Suricata. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-31931?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-31931 have an EU (EUVD) identifier?: Yes. CVE-2026-31931 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18237.
When was CVE-2026-31931 published?: CVE-2026-31931 was published on 2026-04-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:oisf:suricata:*:*:*:*:*:*:*:*

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