Is CVE-2026-46387 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-46387 being exploited in the wild.

How severe is CVE-2026-46387?

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-2026-46387?

A patch was published on 2026-05-19: Suricata 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-2026-46387 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-46387?

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.

CVE-2026-46387: Suricata HTTP/2 decompression denial of service

CVE-2026-46387 · Severity: high · CVSS 7.5 · Published 2026-09-10

Suricata is a network security monitoring engine that inspects incoming traffic for threats. A flaw in its HTTP/2 decompression logic allows an attacker to send specially crafted compressed data that causes the system to allocate excessive memory without bounds, leading to denial of service and loss of monitoring visibility.

Technologies: OISF Suricata. Vendors: OISF.

Quick answers

Is CVE-2026-46387 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-46387 being exploited in the wild.
How severe is CVE-2026-46387?: 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-2026-46387?: A patch was published on 2026-05-19: Suricata 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-2026-46387 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-46387?: 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 decompression bomb attack (CWE-409: improper handling of highly compressed data) in Suricata's HTTP/2 response-body decompression path. The affected component fails to enforce an upper limit on the decompressed buffer size, allowing an attacker to craft an HTTP/2 DATA payload with high compression ratios (using gzip, deflate, or brotli) to trigger unbounded memory allocation. The attack requires network access to send malicious HTTP/2 traffic to a Suricata instance, with no authentication or user interaction needed. Successful exploitation causes denial of service by exhausting memory and disabling network monitoring. Patches are available in Suricata 7.0.16 and 8.0.5; users can mitigate by disabling HTTP/2 support.

Affected products

OISF Suricata prior to 7.0.16 and 8.0.5

Timeline

2026-06-02: disclosed
2026-05-19: patched: Suricata 7.0.16 and 8.0.5 released

References

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