What is CVE-2026-93563?

CVE-2026-93563 is a high-severity vulnerability in Red Hat Build Of Apache Camel For Spring Boot 4, classified under CWE-1035. CVSS score: 7.5/10. Published 2026-09-18.

How severe is CVE-2026-93563?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Red Hat Build Of Apache Camel For Spring Boot 4

CVE-2026-93563

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.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Weakness classification (CWE)

CWE-1035

References

secalert@redhat.com (x_refsource_REDHAT, vdb-entry)
secalert@redhat.com (x_refsource_REDHAT, issue-tracking)

Frequently asked questions

What is CVE-2026-93563?: CVE-2026-93563 is a high-severity vulnerability in Red Hat Build Of Apache Camel For Spring Boot 4, classified under CWE-1035. CVSS score: 7.5/10. Published 2026-09-18.
How severe is CVE-2026-93563?: High severity. CVSS v3 base score is 7.5 out of 10.