What’s Vulnerable › Vulnerabilities

CVE-2026-45761: Suricata detect: case-insensitive frame handling can cause heap buffer overflow during rule load

• Severity: low (CVSS 3.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-10 · updated 2026-09-16
• Weakness: CWE-122

Description

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to versions 7.0.16 and 8.0.5, a crafted rule using mixed-case frame syntax could trigger a heap buffer overflow while Suricata is loading signatures. The issue is reached during rule parsing/loading rather than by network traffic alone. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, preprocess rules to check that frames are all lowercase and/or only load trusted rulesets.

Affected products

• OISF suricata: from 7.0.0 before 7.0.16; from 8.0.0 before 8.0.5 — fixed in 7.0.16, 8.0.5

How to fix

Upgrade to a fixed version: OISF suricata 7.0.16, 8.0.5. Check the vendor advisory for mitigations.

References

• https://forum.suricata.io/t/suricata-8-0-5-and-7-0-16-released/6315
• https://github.com/OISF/suricata/security/advisories/GHSA-r74x-74x5-r9vm
• https://redmine.openinfosecfoundation.org/issues/8526

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