Vulnerability · Published Sep 18, 2026 · Assigned by redhat
CVE-2026-93576Io.netty/netty-codec-smtp: netty netty-codec-smtp — smtp command-name field is not crlf-validated (incomplete fix of cve-2025-59419)
High 7.5
In plain English
A high-severity security flaw in Red Hat build of Apache Camel for Spring Boot 4 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities).
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | netty | no fix listed | DEBIAN-CVE-2026-93576 |
| Debian:13 | netty | no fix listed | DEBIAN-CVE-2026-93576 |
| Debian:14 | netty | no fix listed | DEBIAN-CVE-2026-93576 |
| Ubuntu:26.10 | netty | no fix listed | UBUNTU-CVE-2026-93576 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat build of Apache Camel for Spring Boot 4 | see references |
| Red Hat | Red Hat Fuse 7 | see references |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 | see references |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 | see references |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 | see references |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 | see references |
| Red Hat | Red Hat Single Sign-On 7 | see references |
Weakness: CWE-93 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
References
- https://access.redhat.com/security/cve/CVE-2026-93576 vdb-entry, x_refsource_REDHAT
- RHBZ#2536968 issue-tracking, x_refsource_REDHAT