CVE-2026-76816 Netty: MQTT Topic Name and Client ID Validation Bypass

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.137.Final and 4.2.17.Final, MqttEncoder does not validate client identifiers, will topics, usernames, and PUBLISH topic names before encoding, allowing prohibited null bytes in MQTT UTF-8 string fields and...

CVE-2026-76816

Netty , an asynchronous event-driven network framework, contains a validation bypass in its MqttEncoder prior to versions 4.1.137.Final and 4.2.17.Final . The encoder fails to validate client identifiers, will topics, usernames, and PUBLISH topic names before encoding, allowing prohibited null by...

EUVD-2026-65093

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.137.Final and 4.2.17.Final, MqttEncoder does not validate client identifiers, will topics, usernames, and PUBLISH topic names before encoding, allowing prohibited null bytes in MQTT UTF-8 string fields and...

CVE-2026-76816

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.137.Final and 4.2.17.Final, MqttEncoder does not validate client identifiers, will topics, usernames, and PUBLISH topic names before encoding, allowing prohibited null bytes in MQTT UTF-8 string fields and...

CVE-2026-76816 Netty: MQTT Topic Name and Client ID Validation Bypass

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.137.Final and 4.2.17.Final, MqttEncoder does not validate client identifiers, will topics, usernames, and PUBLISH topic names before encoding, allowing prohibited null bytes in MQTT UTF-8 string fields and...

Memory Leak

Netty is vulnerable to a Memory Leak. The vulnerability is due to failure to release retained or newly allocated ByteBuf objects when IDN.toASCII or encodeDomainName reject a malformed domain name, where the exception occurs before the buffer is assigned to the DnsRecord content field, allowing...

CVE-2026-76816: Improper Input Validation

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.137.Final and 4.2.17.Final, MqttEncoder does not validate client identifiers, will topics, usernames, and PUBLISH topic names before encoding, allowing prohibited null bytes in MQTT UTF-8 string fields and...

PT-2026-81028

Name of the Vulnerable Software and Affected Versions Netty versions prior to 4.1.137.Final Netty versions prior to 4.2.17.Final Description Netty is an asynchronous, event-driven network application framework. The MqttEncoder does not validate client identifiers, will topics, usernames, and...

Null Byte Interaction Error (Poison Null Byte)

Overview Affected versions of this package are vulnerable to Null Byte Interaction Error Poison Null Byte via the Socks4ClientEncoder and Socks5ClientEncoder in codec-socks. An attacker can truncate or alter encoded SOCKS requests by supplying userId, destination host, username, or password value...

Improper Validation of Certificate with Host Mismatch

Overview io.netty:netty-handler is a library that provides an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which...

CVE-2026-62380

Netty io.netty:netty-codec-socks versions 4.2.0.Final through 4.2.16.Final and 4.1.x through 4.1.136.Final contain null byte, CRLF, and credential injection vulnerabilities in the SOCKS4 Socks4ClientEncoder and SOCKS5 Socks5ClientEncoder client encoders, which fail to validate domain address and...

CVE-2026-62243

Netty io.netty:netty-handler versions from 4.2.0.Final through 4.2.16.Final and versions through 4.1.136.Final disable TLS hostname verification on the SslProvider.OPENSSL client path when a plain non-extended X509TrustManager is used and Unsafe-based trust-manager wrapping is unavailable Java 25...

UBUNTU-CVE-2026-62243

Netty io.netty:netty-handler versions from 4.2.0.Final through 4.2.16.Final and versions through 4.1.136.Final disable TLS hostname verification on the SslProvider.OPENSSL client path when a plain non-extended X509TrustManager is used and Unsafe-based trust-manager wrapping is unavailable Java 25...

CVE-2026-62380

Netty io.netty:netty-codec-socks versions 4.2.0.Final through 4.2.16.Final and 4.1.x through 4.1.136.Final contain null byte, CRLF, and credential injection vulnerabilities in the SOCKS4 Socks4ClientEncoder and SOCKS5 Socks5ClientEncoder client encoders, which fail to validate domain address and...

CVE-2026-62243

Netty io.netty:netty-handler versions from 4.2.0.Final through 4.2.16.Final and versions through 4.1.136.Final disable TLS hostname verification on the SslProvider.OPENSSL client path when a plain non-extended X509TrustManager is used and Unsafe-based trust-manager wrapping is unavailable Java 25...

UBUNTU-CVE-2026-62380

Netty io.netty:netty-codec-socks versions 4.2.0.Final through 4.2.16.Final and 4.1.x through 4.1.136.Final contain null byte, CRLF, and credential injection vulnerabilities in the SOCKS4 Socks4ClientEncoder and SOCKS5 Socks5ClientEncoder client encoders, which fail to validate domain address and...

CVE-2026-62380

Netty (io.netty:netty-codec-socks) versions 4.1.x through 4.1.136.Final and 4.2.0.Final through 4.2.16.Final contain null byte and CRLF injection vulnerabilities in the Socks4ClientEncoder and Socks5ClientEncoder . The encoders fail to validate domain address and authentication (username/password...

CVE-2026-62243 Netty 4.2.0 through 4.2.16 TLS Hostname Verification Bypass

Netty io.netty:netty-handler versions from 4.2.0.Final through 4.2.16.Final and versions through 4.1.136.Final disable TLS hostname verification on the SslProvider.OPENSSL client path when a plain non-extended X509TrustManager is used and Unsafe-based trust-manager wrapping is unavailable Java 25...

EUVD-2026-64272

Netty io.netty:netty-codec-socks versions 4.2.0.Final through 4.2.16.Final and 4.1.x through 4.1.136.Final contain null byte, CRLF, and credential injection vulnerabilities in the SOCKS4 Socks4ClientEncoder and SOCKS5 Socks5ClientEncoder client encoders, which fail to validate domain address and...

CVE-2026-62380 Netty before 4.2.16.Final SOCKS Proxy Null Byte Injection

Netty io.netty:netty-codec-socks versions 4.2.0.Final through 4.2.16.Final and 4.1.x through 4.1.136.Final contain null byte, CRLF, and credential injection vulnerabilities in the SOCKS4 Socks4ClientEncoder and SOCKS5 Socks5ClientEncoder client encoders, which fail to validate domain address and...