Use After Free in Oisf Suricata
CVE-2026-45751
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, Suricata's inspection-buffer helper could leave an inspection pointer referencing freed memory after a chained transform caused the backing buffer to be reallocated. The issue is reached during a specific network traffic processing, and requires a specific but not malicious rule. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, avoid rules that chain `dotprefix` transform after another one.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.003 (24.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 24.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.003 · change: -0.002
Affected products
- Oisf Suricata — versions < 7.0.16, >= 8.0.0, < 8.0.5
Weakness classification (CWE)
References
- github.com/OISF/suricata/security/advisories/GHSA-59q6-j4w8-8pjx (Mitigation, Vendor Advisory)
- forum.suricata.io/t/suricata-8-0-5-and-7-0-16-released/6315 (Release Notes)
- redmine.openinfosecfoundation.org/issues/8537 (Permissions Required)
Frequently asked questions
- What is CVE-2026-45751?
- CVE-2026-45751 is a medium-severity vulnerability in Oisf Suricata, classified under Use After Free. CVSS score: 5.9/10. Published 2026-09-10.
- How severe is CVE-2026-45751?
- Medium severity. CVSS v3 base score is 5.9 out of 10.