What is CVE-2026-31937?

CVE-2026-31937 is a high-severity vulnerability in Oisf Suricata, classified under Inefficient Algorithmic Complexity. CVSS score: 7.5/10. Published 2026-04-02.

How severe is CVE-2026-31937?

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

Vulnerability in Oisf Suricata

CVE-2026-31937

Suricata is a network IDS, IPS and NSM engine. Prior to version 7.0.15, inefficiency in DCERPC buffering can lead to a performance degradation. This issue has been patched in version 7.0.15.

Published 2026-04-02 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.005 (38.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001

Affected products

Oisf Suricata — versions < 7.0.15

Weakness classification (CWE)

CWE-407 — Inefficient Algorithmic Complexity

References

github.com/OISF/suricata/security/advisories/GHSA-86vg-w8vm-m3gg (Vendor Advisory)
redmine.openinfosecfoundation.org/issues/8304 (Issue Tracking)

Frequently asked questions

What is CVE-2026-31937?: CVE-2026-31937 is a high-severity vulnerability in Oisf Suricata, classified under Inefficient Algorithmic Complexity. CVSS score: 7.5/10. Published 2026-04-02.
How severe is CVE-2026-31937?: High severity. CVSS v3 base score is 7.5 out of 10.