Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-09-10T00:53:44 io.netty/netty-codec-smtp: Netty netty-codec-smtp — SMTP command-name field is not CRLF-validated (incomplete fix of CVE-2025-59419) 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CWE-93

A flaw was found in Netty netty-codec-smtp. The component does not properly validate Carriage Return (CR) and Line Feed (LF) characters in the SMTP command-name field. A remote attacker, if an application routes untrusted input into this field, can embed CR/LF characters to inject arbitrary SMTP commands. This can lead to SMTP command smuggling, allowing for unauthorized email relay or spoofing of sender/recipient addresses. While the impact is significant, the real-world exploitability is considered lower as applications typically do not place user-controlled data in the command-name field.

A flaw was found in Netty netty-codec-smtp. The component does not properly validate Carriage Return (CR) and Line Feed (LF) characters in the SMTP command-name field. A remote attacker, if an application routes untrusted input into this field, can embed CR/LF characters to inject arbitrary SMTP commands. This can lead to SMTP command smuggling, allowing for unauthorized email relay or spoofing of sender/recipient addresses. While the impact is significant, the real-world exploitability is considered lower as applications typically do not place user-controlled data in the command-name field.

Important: A CRLF injection vulnerability in Netty's `netty-codec-smtp` component allows for SMTP command smuggling. This flaw enables attackers to inject arbitrary SMTP commands, potentially leading to unauthorized relay or spoofing. However, exploitation is limited to applications that route untrusted input into the SMTP command-name field, which is an uncommon configuration, reducing its overall reachability. See https://github.com/netty/netty/security/advisories/GHSA-5vh9-c45f-rf7p for fixed versions and remediation guidance. Red Hat build of Apache Camel for Spring Boot 4 Affected netty-codec-smtp Red Hat Fuse 7 Affected netty-codec-smtp Red Hat JBoss Enterprise Application Platform 7 Will not fix jboss-eap-7/eap74-els-openjdk11-openshift-rhel8 Red Hat JBoss Enterprise Application Platform 7 Will not fix jboss-eap-7/eap74-els-openjdk17-openshift-rhel8 Red Hat JBoss Enterprise Application Platform 7 Will not fix jboss-eap-7/eap74-els-openjdk8-openshift-rhel8 Red Hat JBoss Enterprise Application Platform 7 Will not fix netty-codec-smtp Red Hat Single Sign-On 7 Affected netty-codec-smtp https://www.cve.org/CVERecord?id=CVE-2026-93576 https://nvd.nist.gov/vuln/detail/CVE-2026-93576