CVE-2026-93563
High
Description
A flaw was found in Netty's `SmtpResponseDecoder` component. A remote attacker, acting as a malicious or man-in-the-middle (MITM) SMTP server, could exploit this by sending a specially crafted, unbounded multi-line SMTP response without a terminator. This vulnerability leads to unbounded memory accumulation within the client's Java Virtual Machine (JVM) heap, causing an `OutOfMemoryError` and a denial of service (DoS) due to a process crash.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Red Hat build of Apache Camel for Spring Boot 4
PublishedSep 18, 2026
First seenSep 18, 2026
Weakness typeCWE-1035CWE-1035
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Red Hat Red Hat build of Apache Camel for Spring Boot 4 | No range specified | — |
| Red Hat Red Hat JBoss Enterprise Application Platform 7 | No range specified | — |
| Red Hat Red Hat Single Sign-On 7 | No range specified | — |
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