Resource exhaustion in Oisf Suricata
CVE-2026-63448
Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to 7.0.17 and 8.0.6, the SMB parser can retain force-completed transactions on flows where Suricata sees payload in only one direction, including async-oneside flows, because cleanup waits for inspection in the unseen direction. The transaction creation paths in rust/src/smb can exceed the intended SMB_MAX_TX bound, and cleanup repeatedly scans the growing list. Sustained one-directional SMB traffic can therefore cause unbounded per-flow state and CPU and memory exhaustion. This issue is fixed in versions 8.0.6 and 7.0.17.
Vulnerability class: DoS (Denial of Service)
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: 0.004 (38.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.9% 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: 0.004 · change: 0.000
Affected products
- Oisf Suricata — versions < 7.0.17, >= 8.0.0, < 8.0.6
Weakness classification (CWE)
References
- github.com/OISF/suricata/security/advisories/GHSA-hvvj-c8xx-9g35 (Mitigation, Vendor Advisory)
- github.com/OISF/suricata/commit/755d6c3061de4d7ba97f0ed31cdc17ab8cab4476 (Patch)
- github.com/OISF/suricata/commit/7ec9d72d28b9370712cf77a5b9d40d6b5db27cb4 (Patch)
- github.com/OISF/suricata/commit/88adab8bd3d62912941647ab65032d5ec75c893a (Patch)
- github.com/OISF/suricata/commit/9a54a043516e644bb7b9d34117a91977f950a281 (Patch)
- github.com/OISF/suricata/commit/bc39274a638d1cca2391cfa4891c8b6c255ff9ce (Patch)
- github.com/OISF/suricata/commit/c8f68b0e4f9e721dca1c9ed6e08597c6964c7ac3 (Patch)
- github.com/OISF/suricata/releases/tag/suricata-7.0.17 (Release Notes)
- github.com/OISF/suricata/releases/tag/suricata-8.0.6 (Release Notes)
- redmine.openinfosecfoundation.org/issues/8629 (Permissions Required)
Frequently asked questions
- What is CVE-2026-63448?
- CVE-2026-63448 is a medium-severity vulnerability in Oisf Suricata, classified under Uncontrolled Resource Consumption. CVSS score: 5.9/10. Published 2026-09-18.
- How severe is CVE-2026-63448?
- Medium severity. CVSS v3 base score is 5.9 out of 10.