CVE-2026-63448Suricata smb: some SMB flows can cause resource exhaustion
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.9 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-400, CWE-401, CWE-407
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Sep 22, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
OISF suricata oisf:suricata (from the name) | from 8.0.0, < 8.0.6; before 7.0.17 | CNA record |
oisf suricata oisf:suricata | before 7.0.17; from 8.0.0 before 8.0.6 | NVD |
References
- https://github.com/OISF/suricata/security/advisories/GHSA-hvvj-c8xx-9g35x-refsource-confirm, mitigation, vendor-advisory
- https://github.com/OISF/suricata/commit/755d6c3061de4d7ba97f0ed31cdc17ab8cab4476x-refsource-misc, patch
- https://github.com/OISF/suricata/commit/7ec9d72d28b9370712cf77a5b9d40d6b5db27cb4x-refsource-misc, patch
- https://github.com/OISF/suricata/commit/88adab8bd3d62912941647ab65032d5ec75c893ax-refsource-misc, patch
- https://github.com/OISF/suricata/commit/9a54a043516e644bb7b9d34117a91977f950a281x-refsource-misc, patch
- https://github.com/OISF/suricata/commit/bc39274a638d1cca2391cfa4891c8b6c255ff9cex-refsource-misc, patch
- https://github.com/OISF/suricata/commit/c8f68b0e4f9e721dca1c9ed6e08597c6964c7ac3x-refsource-misc, patch
- https://github.com/OISF/suricata/releases/tag/suricata-7.0.17x-refsource-misc, release-notes
- https://github.com/OISF/suricata/releases/tag/suricata-8.0.6x-refsource-misc, release-notes
- https://redmine.openinfosecfoundation.org/issues/8629x-refsource-misc, permissions-required
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.