CVE-2026-93563 Details
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.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Sep 18, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2026-93563 | [email protected] | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2536976 | [email protected] |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1035 | OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities | [email protected] |
Affected Products
No affected product data is available for this CVE.
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 25, 2026 | CVE Modified | [email protected] |
| Sep 18, 2026 | CVE Modified | [email protected] |
| Sep 18, 2026 | CVE Modified | CISA-ADP |
| Sep 18, 2026 | CVE Modified | [email protected] |
| Sep 18, 2026 | New CVE Received | [email protected] |