Inefficient Algorithmic Complexity in Suricata - CVE-2026-71418
Published: August 20, 2026
Vulnerability identifier: #VU144421
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-71418
CWE-ID: CWE-407
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to inefficient algorithmic complexity in the DNS-over-HTTP/2 handling when processing crafted HTTP/2 DATA frames with the EndOfStream flag set. A remote attacker can send crafted DoH2 traffic containing multiple DATA frames to cause a denial of service.
The issue can degrade packet processing and potentially cause loss of monitoring visibility.
Affected software
Suricata
How to mitigate CVE-2026-71418
Install security update from vendor's website.
Suricata - update to 8.0.6