CVE-2026-61554
Published:September 15, 2026
Updated:October 22, 2026
emp3r0r is a C2 designed by Linux users for Linux environments. Prior to version 4.2.5, the "http_poll" C2 transport accepts attacker-controlled HTTP polling sessions before CBOR "MsgAuth" authentication is completed. A remote unauthenticated attacker can create arbitrary polling sessions and send request bodies that are forwarded into the C2 dispatch path. This can consume server resources and trigger pre-auth C2 processing. Version 4.2.5 patches the issue.
Affected Packages
github.com/jm33-m0/emp3r0r/core (GO):
Affected version(s) >=v0.0.0-20201218095716-f8e4b2776a79 <v0.0.0-20260531142011-aed3d81641abFix Suggestion:
Update to version v0.0.0-20260531142011-aed3d81641abRelated Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Uncontrolled Resource Consumption
EPSS
Base Score:
0.71