OCTOBER 12, 2026
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Case File

CVE-2026-93563

HIGH · CVSS 7.5 EPSS 0.33% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-18 · Last synced 2026-10-12

CyberRota Analysis

AI-Generated

A vulnerability exists in the SmtpResponseDecoder, allowing for unbounded accumulation of multi-line responses, which can lead to memory exhaustion and denial-of-service (DoS) conditions. This issue affects unspecified products that utilize this decoder, making it critical for organizations relying on these systems to prioritize mitigation efforts to prevent potential service disruptions. System administrators and security teams should assess their environments for exposure and implement appropriate safeguards.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
exploit

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-93563
Severity
HIGH
CVSS
7.5
EPSS
0.33%
Java

Original NVD 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.