23 Oct 2026 15:48:27 UTC
Suricata doh2: crafted HTTP/2 DATA frames can cause quadratic CPU consumption
cve-program · CVE-2026-71418 · Published
CVE-2026-71418
Suricata doh2: crafted HTTP/2 DATA frames can cause quadratic CPU consumption
CVSS 3.1 7.5 HIGHCheck source for fixed versionsKEV status unknown
cve-program · CVE-2026-71418
PublishedSuricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, DNS-over-HTTP/2 processing in rust/src/http2/http2.rs retains previously processed HTTP/2 DATA frame contents instead of clearing the internal buffer. Multiple DATA frames with the EndOfStream flag set can grow the buffer to its 65 KiB limit while causing all prior contents to be processed again, producing quadratic CPU complexity, degraded packet processing, loss of monitoring visibility, or denial of service. This issue is fixed in version 8.0.6.
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