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Vulnerability · Published Sep 18, 2026 · Assigned by GitHub_M

CVE-2026-57224Suricata dhcp: unbounded transactions in unidirectional traffic can lead to resource exhaustion

Medium 6.5

In plain English

A medium-severity uncontrolled resource consumption in suricata from OISF. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.4%top 64.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, the DHCP parser in rust/src/dhcp/dhcp.rs creates stateless transactions without recording their packet direction with AppLayerTxData::for_direction(), so a sensor that observes only one direction cannot mark the unseen direction inspected or free completed transactions. The RDP parser in rust/src/rdp/rdp.rs has the same direction-state defect. The per-flow transaction list can grow without bound and cleanup repeatedly scans it, causing increasing CPU and memory consumption and eventual denial of service. This issue is fixed in version 8.0.6.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13suricatano fix listedDEBIAN-CVE-2026-57224
Debian:14suricata1:8.0.6-1DEBIAN-CVE-2026-57224
Ubuntu:22.04:LTSsuricatano fix listedUBUNTU-CVE-2026-57224
Ubuntu:24.04:LTSsuricatano fix listedUBUNTU-CVE-2026-57224
Ubuntu:26.04:LTSsuricatano fix listedUBUNTU-CVE-2026-57224

Affected products (as reported)

VendorProductVersions
OISF suricata >= 8.0.0, < 8.0.6

Weakness: CWE-400, CWE-770 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References