# CVE-2026-45762: Suricata IP defragmentation denial of service

Source: https://junglewise.ai/threats/cve-2026-45762-suricata-ip-defragmentation-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-2026-45762 · Severity: high · CVSS 7.5 · Published 2026-09-10

Suricata is a network security monitoring and intrusion detection system used to identify and block malicious traffic. A bug in its packet reassembly logic allows an attacker to send specially crafted fragmented network packets that crash the system, causing it to stop monitoring network traffic. This creates a brief window where attacks could go undetected.

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

## Quick answers

**Is CVE-2026-45762 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-45762 being exploited in the wild.

**How severe is CVE-2026-45762?** High severity, with a CVSS score of 7.5, published 10 September 2026.

**Which products and versions are affected?** OISF Suricata prior to 7.0.16 and 8.0.5.

**Is there a fix for CVE-2026-45762?** A patch was published on 2026-05-19: Versions 7.0.16 and 8.0.5 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-45762 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-45762?** 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

Suricata's IP defragmentation module failed to validate that a cached defragmentation tracker used the same IP address family (IPv4 or IPv6) as the current packet being processed. An attacker can send a sequence of crafted IPv4/IPv6 fragmented packets that cause an IPv6 fragment to be incorrectly associated with an IPv4 defragmentation tracker. When Suricata attempts to reassemble these mismatched fragments, the type confusion results in a remote, unauthenticated, crash. The attack is network-reachable with no privileges or user interaction required. Patches are available in versions 7.0.16 and 8.0.5. As a workaround, enabling AF_PACKET's defrag option in IDS mode may prevent these crafted packets from reaching Suricata.

## Affected products

- OISF Suricata prior to 7.0.16 and 8.0.5

## Timeline

- 2026-09-10: disclosed
- 2026-05-19: patched: Versions 7.0.16 and 8.0.5 released

## 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-gv2j-f6jv-3878](https://github.com/OISF/suricata/security/advisories/GHSA-gv2j-f6jv-3878)

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