Is CVE-2026-71418 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-71418 being exploited in the wild.

How severe is CVE-2026-71418?

High severity, with a CVSS score of 7.5, published 18 September 2026.

Which products and versions are affected?

OISF Suricata 8.0.0 through 8.0.5.

Is there a fix for CVE-2026-71418?

A patch was published on 2026-09-18: Fixed in version 8.0.6 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-71418 attacked?

It is attacked over the network, in an operating system.

Am I affected by CVE-2026-71418?

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-2026-71418: Suricata DNS-over-HTTP/2 buffer memory handling denial of service

CVE-2026-71418 · Severity: high · CVSS 7.5 · Published 2026-09-18

Suricata is a network intrusion detection and prevention system used to monitor and protect network traffic. Versions 8.0.0 through 8.0.5 have a flaw in DNS-over-HTTP/2 processing that allows attackers to cause excessive CPU consumption and degrade monitoring visibility by sending specially crafted HTTP/2 frames, potentially leading to service disruption or denial of service.

Technologies: OISF Suricata. Vendors: OISF.

Quick answers

Is CVE-2026-71418 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-71418 being exploited in the wild.
How severe is CVE-2026-71418?: High severity, with a CVSS score of 7.5, published 18 September 2026.
Which products and versions are affected?: OISF Suricata 8.0.0 through 8.0.5.
Is there a fix for CVE-2026-71418?: A patch was published on 2026-09-18: Fixed in version 8.0.6 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-71418 attacked?: It is attacked over the network, in an operating system.
Am I affected by CVE-2026-71418?: 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

DNS-over-HTTP/2 processing in rust/src/http2/http2.rs fails to clear internal buffers after processing HTTP/2 DATA frames, allowing multiple frames with the EndOfStream flag to grow the 65 KiB buffer while reprocessing all prior contents, resulting in quadratic CPU complexity. The vulnerability requires network access to send malicious HTTP/2 frames and is fixed by clearing the data buffer after processing each frame.

Affected products

OISF Suricata 8.0.0 through 8.0.5

Timeline

2026-09-18: disclosed
2026-09-18: patched: Fixed in version 8.0.6

References

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