# CVE-2026-45764: Suricata HTTP/2 type confusion denial of service

Source: https://junglewise.ai/threats/cve-2026-45764-suricata-http-2-type-confusion-denial-of-service  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-10. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-45764 · Severity: critical · CVSS 9.1 · Published 2026-09-10

Suricata is a network security monitoring and intrusion detection/prevention system used to protect enterprise networks by analyzing traffic patterns. A flaw in HTTP/2 protocol handling could allow an attacker to craft malicious network traffic that causes Suricata to crash, disabling security monitoring and leaving the network unprotected during the outage.

Technologies: [OISF Suricata](https://junglewise.ai/threats/technologies/suricata). Vendors: [OISF](https://junglewise.ai/threats/vendors/oisf).

## Quick answers

**Is CVE-2026-45764 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-45764 being exploited in the wild.

**How severe is CVE-2026-45764?** Critical severity, with a CVSS score of 9.1, published 10 September 2026.

**Which products and versions are affected?** OISF Suricata 7.0.x before 7.0.16, 8.0.x before 8.0.5.

**Is there a fix for CVE-2026-45764?** A patch was published on 2026-05-19: Suricata 7.0.16 and 8.0.5 released with fixes Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-45764 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-45764?** Check whether you run OISF Suricata at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a type confusion flaw (CWE-843) in Suricata's HTTP/2 protocol parsing logic. When processing specially crafted HTTP/2 traffic, a protocol state change causes the application to access a resource using an incompatible type, leading to memory corruption and a crash. The vulnerability requires network-level access to send crafted packets and affects Suricata 7.0.x before 7.0.16 and 8.0.x before 8.0.5. No privilege escalation or user interaction is required. An attacker can trigger a denial of service by remotely sending malicious HTTP/2 frames. The fix is available in Suricata 7.0.16 and 8.0.5; as a temporary workaround, HTTP/2 parsing can be disabled.

## Affected products

- OISF Suricata 7.0.x before 7.0.16, 8.0.x before 8.0.5

## Timeline

- 2026-05-19: disclosed
- 2026-05-19: patched: Suricata 7.0.16 and 8.0.5 released with fixes

## References

- [https://forum.suricata.io/t/suricata-8-0-5-and-7-0-16-released/6315](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://github.com/OISF/suricata/security/advisories/GHSA-5rvq-72r5-rqhr)

## Related threats

- [Suricata use-after-free in HTTP/2 response header detection](https://junglewise.ai/threats/cve-2026-94084-suricata-before-8-0-7-has-an-http2threadmultibuf-use-after-free)
- [Suricata DoH2 type confusion in HTTP state cleanup](https://junglewise.ai/threats/cve-2026-94083-suricata-before-8-0-7-has-a-doh2-type-confusion-that-can-cause-an)
- [Suricata IP family validation bypass in flow comparison](https://junglewise.ai/threats/cve-2026-71855-suricata-is-a-network-intrusion-detection-system-intrusion)
- [Suricata DNS-over-HTTP/2 buffer memory handling denial of service](https://junglewise.ai/threats/cve-2026-71418-suricata-is-a-network-intrusion-detection-system-intrusion)
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