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.
CVE-2026-71418
HIGHPre-NVD 7.57.5
EchelonGraph scoreLOW confidence
This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: secondary
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 7.5Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.5
- EG Score
- 7.5(low)
- EG Risk
- 38(Track)EG Risk 38/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity75% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- —
- EPSS %ILE
- —
- KEV
- Not listed
Published
September 18, 2026
Last Modified
September 18, 2026
Advisory Details (5)
Auto-updated Sep 18, 2026Patch available. Sources: github, github_commit, github_release.
generic
Security #8725: doh2: quadratic complexity due to buffer not being reset - Suricata - Open Information Security Foundation
https://redmine.openinfosecfoundation.org/issues/8725github_release Patch Available
8.0.6
Patch available: OISF/suricata suricata-8.0.6
https://github.com/OISF/suricata/releases/tag/suricata-8.0.6github_commit Patch Available
commit 26c26dea84f0 (OISF/suricata)
Patch available: OISF/suricata suricata-8.0.6 (contains commit 26c26dea84f0)
https://github.com/OISF/suricata/commit/26c26dea84f00de95151a0e16d21c1fcafac9648github_commit
commit 1731805967ed (OISF/suricata)
Fix landed in OISF/suricata commit 1731805967ed — awaiting tagged release
https://github.com/OISF/suricata/commit/1731805967edf5d31448db2ae43cf72c6cf46c11github Patch Available
doh2: crafted HTTP/2 DATA frames can cause quadratic CPU consumption · Advisory · OISF/suricata · GitHub
https://github.com/OISF/suricata/security/advisories/GHSA-xjgq-3qw4-jp5fWeakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 3× in last 7d / 3× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-09-18 21:27 UTCEG score recompute
- 2026-09-18 20:34 UTCEG score recompute
- 2026-09-18 20:34 UTCMITRE cvelistV5first tracked
Frequently asked(4)
What is CVE-2026-71418?
CVE-2026-71418 is a high vulnerability published on September 18, 2026. 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.…
When was CVE-2026-71418 disclosed?
CVE-2026-71418 was first published in the National Vulnerability Database on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-71418?
CVE-2026-71418 has a CVSS v3 base score of 7.5 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-71418?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-71418, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-71418
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