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netty

A vulnerability in Netty's SmtpResponseDecoder component allows a remote attacker, acting as a malicious or man-in-the-middle SMTP server, to send a crafted unbounded multi-line SMTP response without a terminator. This causes unbounded memory accumulation in the client's JVM heap, leading to an OutOfMemoryError and denial of service due to process crash.

CVE-2026-93563 is a medium severity vulnerability in Netty's SmtpResponseDecoder component. A remote attacker can exploit this by sending a specially crafted, unbounded multi-line SMTP response lacking a terminator, causing the client's Java Virtual Machine heap to accumulate memory without bounds. This results in an OutOfMemoryError and a denial of service condition due to process crash. The vulnerability affects multiple specific Netty versions as listed.

Detailed information about A flaw was found in Netty's SmtpResponseDecoder component. (CVE-2026-93563) affecting null netty. Get real-time updates, technical de

A flaw was found in Netty's SmtpResponseDecoder component. (CVE-2026-93563) - Live Threat Intelligence - Threat Radar | OffSeq.com

A flaw was found in Netty's SmtpResponseDecoder component. (CVE-2026-93563)

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