CVE-2026-71855
An IPv6 packet can therefore reuse IPv4 flow state or the reverse, causing incorrect flowbit state, detection bypass, or IP-only bypass.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.31%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 0.31% probability · 24th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-697
- Affected
- oisf/suricata
- Source
- security-advisories@github.com
EPSS 0.3% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/OISF/suricata/commit/181b3b2fdd1fe87e4534de4fc79e29a083ef125fPatch
- https://github.com/OISF/suricata/commit/4e2f23d031fbcfd72883bacd3d723c9874f23701Patch
- https://github.com/OISF/suricata/commit/bc41dcc854e24487d3786ce578a8a86a8350ab20Patch
- https://github.com/OISF/suricata/releases/tag/suricata-7.0.17Release Notes
- https://github.com/OISF/suricata/releases/tag/suricata-8.0.6Release Notes
- https://github.com/OISF/suricata/security/advisories/GHSA-fvwh-wjcq-2586Vendor Advisory
- https://redmine.openinfosecfoundation.org/issues/8558Permissions Required
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.