CVE-2026-93576

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.

Score

CVSS 3.1 7.5 High

Status

Awaiting Analysis - secalert@redhat.com

Published

2026-09-18

Last modified

2026-09-25

Weaknesses

CWE-93

Affected products

• Camel Spring Boot (Redhat)
• Jboss Enterprise Application Platform (Redhat)
• Jboss Fuse (Redhat)
• Red Hat Single Sign On (Redhat)

References

• https://access.redhat.com/security/cve/CVE-2026-93576
• https://bugzilla.redhat.com/show_bug.cgi?id=2536968