Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to 7.0.17 and 8.0.6, src/flow-hash.c can treat an IPv4 and IPv6 flow as equal without comparing the IP family when their raw address words, ports, protocol, VLAN, recursion level, live device, and hash bucket align. An IPv6 packet can therefore reuse IPv4 flow state or the reverse, causing incorrect flowbit state, detection bypass, or IP-only bypass. This issue is fixed in versions 8.0.6 and 7.0.17.
CVE-2026-71855
MEDIUMPre-NVD 5.95.9
EchelonGraph scoreLOW confidence
This medium-severity CVE scores 5.9 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
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.9Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 5.9
- EG Score
- 5.9(low)
- EG Risk
- 31(Track)EG Risk 31/100SSVC: 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 computedSeverity59% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 24%
- KEV
- Not listed
Published
September 18, 2026
Last Modified
September 18, 2026
Advisory Details (7)
Auto-updated Sep 18, 2026Patch available. Sources: github, github_commit, github_release.
github_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_release Patch Available
7.0.17
Patch available: OISF/suricata suricata-7.0.17
https://github.com/OISF/suricata/releases/tag/suricata-7.0.17github_commit
commit bc41dcc854e2 (OISF/suricata)
Fix landed in OISF/suricata commit bc41dcc854e2 — awaiting tagged release
https://github.com/OISF/suricata/commit/bc41dcc854e24487d3786ce578a8a86a8350ab20github_commit Patch Available
commit 4e2f23d031fb (OISF/suricata)
Patch available: OISF/suricata suricata-8.0.6 (contains commit 4e2f23d031fb)
https://github.com/OISF/suricata/commit/4e2f23d031fbcfd72883bacd3d723c9874f23701github_commit Patch Available
commit 181b3b2fdd1f (OISF/suricata)
Patch available: OISF/suricata suricata-7.0.17 (contains commit 181b3b2fdd1f)
https://github.com/OISF/suricata/commit/181b3b2fdd1fe87e4534de4fc79e29a083ef125fgithub Patch Available
flow: IPv4/IPv6 hash collision can reuse wrong flow state · Advisory · OISF/suricata · GitHub
https://github.com/OISF/suricata/security/advisories/GHSA-fvwh-wjcq-2586Weakness 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(5)
What is CVE-2026-71855?
CVE-2026-71855 is a medium vulnerability published on September 18, 2026. Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to 7.0.17 and 8.0.6, src/flow-hash.c can treat an IPv4 and IPv6 flow as equal without comparing the IP family when their raw address words, ports, protocol, VLAN, recursion…
When was CVE-2026-71855 disclosed?
CVE-2026-71855 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.
Is CVE-2026-71855 actively exploited?
CVE-2026-71855 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 75.7% of all scored CVEs.
What is the CVSS score of CVE-2026-71855?
CVE-2026-71855 has a CVSS v3 base score of 5.9 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-71855?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-71855, 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-2026-71855
Is Your Infrastructure Affected by CVE-2026-71855?
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