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CVE-2026-71855
Suricata flow: IPv4/IPv6 hash collision can reuse wrong flow state
Medium5.9EPSS 0.31%
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
Description
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVDNVD · Analyzed | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.31% · top 76% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.
Weakness
Affected products
References (7)
- https://github.com/OISF/suricata/security/advisories/GHSA-fvwh-wjcq-2586 (opens in a new tab)x_refsource_CONFIRM
- https://github.com/OISF/suricata/commit/181b3b2fdd1fe87e4534de4fc79e29a083ef125f (opens in a new tab)x_refsource_MISC
- https://github.com/OISF/suricata/commit/4e2f23d031fbcfd72883bacd3d723c9874f23701 (opens in a new tab)x_refsource_MISC
- https://github.com/OISF/suricata/commit/bc41dcc854e24487d3786ce578a8a86a8350ab20 (opens in a new tab)x_refsource_MISC
- https://github.com/OISF/suricata/releases/tag/suricata-7.0.17 (opens in a new tab)x_refsource_MISC
- https://github.com/OISF/suricata/releases/tag/suricata-8.0.6 (opens in a new tab)x_refsource_MISC
- https://redmine.openinfosecfoundation.org/issues/8558 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-71855)Record last updated .