cve-2026-93576

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    "title": "io.netty/netty-codec-smtp: Netty netty-codec-smtp — SMTP command-name field is not CRLF-validated (incomplete fix of CVE-2025-59419)",
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      "cwe": {
        "id": "CWE-93",
        "name": "Improper Neutralization of CRLF Sequences ('CRLF Injection')"
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          "category": "description",
          "text": "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.",
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          "text": "io.netty/netty-codec-smtp: Netty netty-codec-smtp — SMTP command-name field is not CRLF-validated (incomplete fix of CVE-2025-59419)",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "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.",
          "title": "Statement"
        },
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          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
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      "title": "io.netty/netty-codec-smtp: Netty netty-codec-smtp — SMTP command-name field is not CRLF-validated (incomplete fix of CVE-2025-59419)"
    }
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