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Vulnerability · Published Sep 18, 2026 · Assigned by GitHub_M

CVE-2026-57227Suricata mqtt: unbounded resource consumption from repeated pubrec and pubrel messages

High 7.5

In plain English

A high-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 0.7% (higher than 53% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.7%top 46.7% 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 7.0.0 until 7.0.17 and 8.0.6, the MQTT parser in rust/src/mqtt/mqtt.rs permits repeated PUBREC or PUBREL messages to be appended to one transaction without a limit. Crafted MQTT traffic can grow transaction state indefinitely, consuming CPU and memory and causing slowdown or denial of service. This issue is fixed in versions 8.0.6 and 7.0.17.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13suricatano fix listedDEBIAN-CVE-2026-57227
Debian:14suricata1:8.0.6-1DEBIAN-CVE-2026-57227
Ubuntu:22.04:LTSsuricatano fix listedUBUNTU-CVE-2026-57227
Ubuntu:24.04:LTSsuricatano fix listedUBUNTU-CVE-2026-57227
Ubuntu:26.04:LTSsuricatano fix listedUBUNTU-CVE-2026-57227

Affected products (as reported)

VendorProductVersions
OISF suricata >= 8.0.0, < 8.0.6>= 7.0.0, < 7.0.17

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

References