High severity · published Apr 2, 2026
CVE-2026-31933
Suricata stream: quadratic complexity in stream inspection
7.5
CVSS
0.4%
EPSS
No
On KEV
Description
Suricata is a network IDS, IPS and NSM engine. Prior to versions 7.0.15 and 8.0.4, specially crafted traffic can cause Suricata to slow down, affecting performance in IDS mode. This issue has been patched in versions 7.0.15 and 8.0.4.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SU
suricata · OISF
< 7.0.15; >= 8.0.0, < 8.0.4 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-31933
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-31933
Vendor Advisory
https://github.com/OISF/suricata/security/advisories/GHSA-hvp5-gpr6-j4gp
Issue Tracking
https://redmine.openinfosecfoundation.org/issues/8272
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