{"id":"CVE-2026-93576","title":"A flaw was found in Netty netty-codec-smtp","summary":"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…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","cwe":["CWE-93"],"vendor":"Red Hat","product":"netty-codec-smtp","affected":["netty-codec-smtp (all versions)","netty-codec-smtp (all versions)","jboss-eap-7/eap74-els-openjdk11-openshift-rhel8 (all versions)","jboss-eap-7/eap74-els-openjdk17-openshift-rhel8 (all versions)","jboss-eap-7/eap74-els-openjdk8-openshift-rhel8 (all versions)","netty-codec-smtp (all versions)","netty-codec-smtp (all versions)"],"published":"2026-09-18","updated":"2026-09-18","sourceUpdated":"2026-09-18T21:18:48.540","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93576","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-93576","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536968","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93576.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93576"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93576"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-18T14:58:44.082356Z"},"ingestedAt":"2026-09-18T14:43:13.060Z","epss":0.00269,"epssPercentile":0.19339,"slug":"CVE-2026-93576","body":"## Overview\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat build of Apache Camel for Spring Boot 4, Red Hat Fuse 7, Red Hat JBoss Enterprise Application Platform 7, Red Hat Single Sign-On 7 · no fix planned: Red Hat JBoss Enterprise Application Platform 7, Red Hat build of Apache Camel for Spring Boot 4, Red Hat Fuse 7, Red Hat Single Sign-On 7 · updated 2026-09-22 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93576.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}