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CVE-2026-63448

5.9 · MEDIUM

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine.

Published Sep 18, 2026oisfCWE-400EPSS 0.45%

Overview

CVE-2026-63448 is a medium-severity vulnerability affecting oisf suricata. It was published on September 18, 2026 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from oisf. Update suricata to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
oisfsuricata>= 0, < 7.0.17Affected

References

GitHubgithub.com/OISF/suricata/commit/755d6c3061de4d7ba97f0ed31cdc17ab8cab4476GitHubgithub.com/OISF/suricata/commit/7ec9d72d28b9370712cf77a5b9d40d6b5db27cb4GitHubgithub.com/OISF/suricata/commit/88adab8bd3d62912941647ab65032d5ec75c893aGitHubgithub.com/OISF/suricata/commit/9a54a043516e644bb7b9d34117a91977f950a281GitHubgithub.com/OISF/suricata/commit/bc39274a638d1cca2391cfa4891c8b6c255ff9ceGitHubgithub.com/OISF/suricata/commit/c8f68b0e4f9e721dca1c9ed6e08597c6964c7ac3GitHubgithub.com/OISF/suricata/releases/tag/suricata-7.0.17GitHubgithub.com/OISF/suricata/releases/tag/suricata-8.0.6GitHubgithub.com/OISF/suricata/security/advisories/GHSA-hvvj-c8xx-9g35Refredmine.openinfosecfoundation.org/issues/8629

How CyberStrike helps

Frequently asked questions

What is CVE-2026-63448?

CVE-2026-63448 is a medium-severity vulnerability affecting oisf suricata. It was published on September 18, 2026 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2026-63448?

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-63448?

Check the references section for vendor advisories and patches from oisf. Update suricata to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-63448?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-63448 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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