EIP-2026-103643

PRE-CVE

QK SMTP Server - Malformed Commands Multiple Remote Denial of Service Vulnerabilities

Title source: legacy
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for EIP-2026-103643. PoCs published by Juan Pablo Lopez Yacubian.

AI-analyzed exploit summary This exploit demonstrates multiple denial-of-service vulnerabilities in QK SMTP Server by sending malformed SMTP commands with excessive path traversal sequences. The repeated '../A/' pattern causes the server to crash, denying service to legitimate users.

Description

QK SMTP Server - Malformed Commands Multiple Remote Denial of Service Vulnerabilities

Exploits (1)

exploitdb WORKING POC VERIFIED
by Juan Pablo Lopez Yacubian · textdosmultiple
https://www.exploit-db.com/exploits/30885

This exploit demonstrates multiple denial-of-service vulnerabilities in QK SMTP Server by sending malformed SMTP commands with excessive path traversal sequences. The repeated '../A/' pattern causes the server to crash, denying service to legitimate users.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: QK SMTP Server 3
No auth needed
Prerequisites: network access to the SMTP server
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Details

Status pre_cve
Tracked Since Feb 18, 2026