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NVD description
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.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
NONE
CVE-2026-93576 Netty netty-codec-smtp — SMTP command-name field is not CRLF-validated (incomplete fix of CVE-2025-59419) https://www.cve.org/CVERecord?id=CVE-2026-93576
Post summary
The tweet reports CVE‑2026‑93576, noting an incomplete fix for an SMTP command‑name validation issue in Netty and linking to the CVE record, without providing exploit code, active exploitation evidence, or a patch.