Vulnerability in Oisf Suricata
CVE-2026-71418
Suricata 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (49.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Oisf Suricata — versions >= 8.0.0, < 8.0.6
Weakness classification (CWE)
References
- github.com/OISF/suricata/security/advisories/GHSA-xjgq-3qw4-jp5f (Mitigation, Vendor Advisory)
- github.com/OISF/suricata/commit/1731805967edf5d31448db2ae43cf72c6cf46c11 (Patch)
- github.com/OISF/suricata/commit/26c26dea84f00de95151a0e16d21c1fcafac9648 (Patch)
- github.com/OISF/suricata/releases/tag/suricata-8.0.6 (Release Notes)
- redmine.openinfosecfoundation.org/issues/8725 (Issue Tracking)
Frequently asked questions
- What is CVE-2026-71418?
- CVE-2026-71418 is a high-severity vulnerability in Oisf Suricata, classified under Inefficient Algorithmic Complexity. CVSS score: 7.5/10. Published 2026-09-18.
- How severe is CVE-2026-71418?
- High severity. CVSS v3 base score is 7.5 out of 10.