Quadratic Complexity Issue in Suricata Email Handling Engine
CVE-2026-31934

7.5HIGH

Key Information:

Vendor

Oisf

Status
Suricata
Vendor
CVE Published:
2 April 2026

What is CVE-2026-31934?

Suricata, a sophisticated network intrusion detection and prevention system, has a vulnerability that arises from quadratic complexity during URL searches in MIME-encoded messages processed over SMTP. This performance-related issue is present in versions 8.0.0 to 8.0.3, potentially leading to significant slowdowns during email analysis. Users are advised to upgrade to version 8.0.4 or later, where this issue has been addressed, ensuring improved performance and stability.

Affected Version(s)

suricata >= 8.0.0, < 8.0.4

References

https://github.com/OISF/suricata/security/advisories/GHSA...
x_refsource_CONFIRM
https://redmine.openinfosecfoundation.org/issues/8292
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.