High severity · published Sep 18, 2026
CVE-2026-57227
Suricata mqtt: unbounded resource consumption from repeated pubrec and pubrel messages
7.5
CVSS
0.7%
EPSS
No
On KEV
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.
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)0.7% · higher than 53% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SU
suricata · OISF
>= 8.0.0, < 8.0.6; >= 7.0.0, < 7.0.17 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-57227
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-57227
Patch
https://github.com/OISF/suricata/commit/03ba8a71d827dd36a0ceb512f45d2f440f260a3a
Patch
https://github.com/OISF/suricata/commit/5cde93dea38533c9b225128ba9d54955997dc273
Patch
https://github.com/OISF/suricata/commit/c03666d261256df5a2d1f5800872da8a5addf6a5
Release Notes
https://github.com/OISF/suricata/releases/tag/suricata-7.0.17
Release Notes
https://github.com/OISF/suricata/releases/tag/suricata-8.0.6
Mitigation
https://github.com/OISF/suricata/security/advisories/GHSA-7h2h-hpj2-9w6p
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