CVE-2026-93563Patch

LOWCVSS 7.5 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

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.

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0.5/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-1035

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Threat summary

Patch or workaround signal is available
1 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 1 signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Patch

1100.0%

Full discourse1 post

DFIR Lab@DFIR_Lab46d
Patch
🚨 HIGH Severity: CVE-2026-93563 (CVSS 7.5) Unbounded multi-line response accumulation in SmtpResponseDecoder causes memory-exhaustion DoS. Network exploitable, no authentication required. Patch immediately. #CVE #Vulnerability #PatchNow #ThreatIntel #DFIR https://t.co/6WZoOe592s
Post summary
A high-severity DoS vulnerability (CVSS 7.5) in SmtpResponseDecoder is disclosed with technical details and an explicit call to patch immediately; no PoC, exploit tool, or active exploitation evidence is mentioned.
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