Vulnerability in Oisf Suricata
CVE-2026-31934
Suricata is a network IDS, IPS and NSM engine. From version 8.0.0 to before version 8.0.4, there is a quadratic complexity issue when searching for URLs in mime encoded messages over SMTP leading to a performance impact. This issue has been patched in version 8.0.4.
Published · last modified .
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 .
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: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Oisf Suricata — versions >= 8.0.0, < 8.0.4
Weakness classification (CWE)
References
- github.com/OISF/suricata/security/advisories/GHSA-hr89-h2pp-f3c8 (Vendor Advisory)
- redmine.openinfosecfoundation.org/issues/8292 (Permissions Required, Issue Tracking)
Frequently asked questions
- What is CVE-2026-31934?
- CVE-2026-31934 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-2026-31934?
- High severity. CVSS v3 base score is 7.5 out of 10.