Buffer overflow in Oisf Suricata
CVE-2026-45761
Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to versions 7.0.16 and 8.0.5, a crafted rule using mixed-case frame syntax could trigger a heap buffer overflow while Suricata is loading signatures. The issue is reached during rule parsing/loading rather than by network traffic alone. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, preprocess rules to check that frames are all lowercase and/or only load trusted rulesets.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.002 (7.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Oisf Suricata — versions < 7.0.16, >= 8.0.0, < 8.0.5
Weakness classification (CWE)
References
- forum.suricata.io/t/suricata-8-0-5-and-7-0-16-released/6315 (Release Notes, Vendor Advisory)
- github.com/OISF/suricata/security/advisories/GHSA-r74x-74x5-r9vm (Vendor Advisory)
- redmine.openinfosecfoundation.org/issues/8526 (Permissions Required)
Frequently asked questions
- What is CVE-2026-45761?
- CVE-2026-45761 is a low-severity vulnerability in Oisf Suricata, classified under Heap-based Buffer Overflow. CVSS score: 3.3/10. Published 2026-09-10.
- How severe is CVE-2026-45761?
- Low severity. CVSS v3 base score is 3.3 out of 10.