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CVE-2026-45764: Suricata http2: protocol-change type confusion can lead to denial of service

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% 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-843

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 protocol change while processing HTTP/2 traffic could lead to type confusion in Suricata. Crafted traffic may cause Suricata to crash, resulting in denial of service. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, disable HTTP/2 parsing if it is not required.

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-5rvq-72r5-rqhr
• https://redmine.openinfosecfoundation.org/issues/8492

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