CVE-2026-31934

| EUVD-2026-18243 HIGH
2026-04-02 GitHub_M
7.5
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

4
Patch Released
Apr 02, 2026 - 20:30 nvd
Patch available
EUVD ID Assigned
Apr 02, 2026 - 15:00 euvd
EUVD-2026-18243
Analysis Generated
Apr 02, 2026 - 15:00 vuln.today
CVE Published
Apr 02, 2026 - 14:21 nvd
HIGH 7.5

Tags

Information Disclosure

Description

Suricata is a network IDS, IPS and NSM engine. From version 8.0.0 to before version 8.0.4, there is a quadratic complexity issue when searching for URLs in mime encoded messages over SMTP leading to a performance impact. This issue has been patched in version 8.0.4.

Analysis

Denial of service in Suricata 8.0.0 through 8.0.3 allows unauthenticated remote attackers to degrade performance via specially crafted SMTP traffic containing MIME-encoded messages with URLs. The quadratic complexity vulnerability (CWE-407) triggers excessive processing when the IDS/IPS engine searches for URLs in malformed messages. …

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Remediation

Within 24 hours: Inventory all Suricata deployments and identify systems running versions 8.0.0-8.0.3. Within 7 days: Upgrade to Suricata 8.0.4 or later if available from vendor, or apply vendor-recommended workarounds. …

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Priority Score

38
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +38
POC: 0

Vendor Status

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CVE-2026-31934 vulnerability details – vuln.today
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