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Vulnerability · Published Sep 18, 2026 · Assigned by GitHub_M

CVE-2026-63448Suricata smb: some SMB flows can cause resource exhaustion

Medium 5.9

In plain English

A medium-severity uncontrolled resource consumption in suricata from OISF. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.9Medium
Exploit odds (30 days)0.4%top 60.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13suricatano fix listedDEBIAN-CVE-2026-63448
Debian:14suricata1:8.0.6-1DEBIAN-CVE-2026-63448
Ubuntu:22.04:LTSsuricatano fix listedUBUNTU-CVE-2026-63448
Ubuntu:24.04:LTSsuricatano fix listedUBUNTU-CVE-2026-63448
Ubuntu:26.04:LTSsuricatano fix listedUBUNTU-CVE-2026-63448

Affected products (as reported)

VendorProductVersions
OISF suricata >= 8.0.0, < 8.0.6< 7.0.17

Weakness: CWE-400, CWE-401, CWE-407 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References