CVE-2026-71855Suricata flow: IPv4/IPv6 hash collision can reuse wrong flow state
Updated under an hour ago ()
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It affects OISF suricata. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.9 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- Weakness (CWE)
- CWE-697
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Sep 25, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
OISF suricata oisf:suricata (from the name) | from 8.0.0, < 8.0.6; before 7.0.17 | CNA record |
oisf suricata oisf:suricata | before 7.0.17; from 8.0.0 before 8.0.6 | NVD |
References
- https://github.com/OISF/suricata/security/advisories/GHSA-fvwh-wjcq-2586x-refsource-confirm, vendor-advisory
- https://github.com/OISF/suricata/commit/181b3b2fdd1fe87e4534de4fc79e29a083ef125fx-refsource-misc, patch
- https://github.com/OISF/suricata/commit/4e2f23d031fbcfd72883bacd3d723c9874f23701x-refsource-misc, patch
- https://github.com/OISF/suricata/commit/bc41dcc854e24487d3786ce578a8a86a8350ab20x-refsource-misc, patch
- https://github.com/OISF/suricata/releases/tag/suricata-7.0.17x-refsource-misc, release-notes
- https://github.com/OISF/suricata/releases/tag/suricata-8.0.6x-refsource-misc, release-notes
- https://redmine.openinfosecfoundation.org/issues/8558x-refsource-misc, permissions-required
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.