Vulnerability in Oisf Suricata
CVE-2026-63446
Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, AppLayerParserSetTransactionInspectId() in src/app-layer-parser.c uses an inverted guard and marks only already-inspected transactions as inspected. On flows passed by a pass rule or pass-the-flow exception policy, detection is skipped, so completed transactions remain unmarked, are never freed, and are repeatedly rescanned. The per-flow list can grow without bound with quadratic cleanup cost, causing CPU and memory exhaustion. This issue is fixed in version 8.0.6.
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: 0.007 (52.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Oisf Suricata — versions >= 8.0.0, < 8.0.6
Weakness classification (CWE)
References
- github.com/OISF/suricata/security/advisories/GHSA-gjwr-75gq-877m (Mitigation, Vendor Advisory)
- github.com/OISF/suricata/pull/15726 (Patch)
- github.com/OISF/suricata/commit/006e21c1ccc38c1c815e7945d54b4638cc5f0de8 (Patch)
- github.com/OISF/suricata/commit/60a83c62a1dfdfb589b2bad27fb7fc339fc964b7 (Patch)
- github.com/OISF/suricata/releases/tag/suricata-8.0.6 (Release Notes)
- redmine.openinfosecfoundation.org/issues/8628 (Permissions Required)
Frequently asked questions
- What is CVE-2026-63446?
- CVE-2026-63446 is a high-severity vulnerability in Oisf Suricata, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 7.5/10. Published 2026-09-18.
- How severe is CVE-2026-63446?
- High severity. CVSS v3 base score is 7.5 out of 10.