What’s Vulnerable › Vulnerabilities

CVE-2026-93575: Io.netty/netty-codec-mqtt: netty: resource exhaustion in mqttdecoder

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-18 · updated 2026-09-25
• Weakness: CWE-1035

Description

A flaw was found in Netty's MqttDecoder. An unauthenticated remote attacker can exploit this vulnerability by sending a specially crafted MQTT CONNECT packet. The decoder fails to properly validate the 'Properties Length' against the 'Remaining Length', allowing an attacker to bypass size limits. This leads to excessive memory and CPU consumption, resulting in a denial of service (DoS) due to an OutOfMemoryError.

Affected products

• Red Hat AMQ Broker 7: all versions
• Red Hat build of Apache Camel for Spring Boot 4: all versions
• Red Hat JBoss Enterprise Application Platform 7: all versions
• Red Hat Single Sign-On 7: all versions

References

• https://access.redhat.com/security/cve/CVE-2026-93575
• https://bugzilla.redhat.com/show_bug.cgi?id=2536967

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