# CVE-2026-61554

## Summary

- **CVE ID:** CVE-2026-61554
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-400
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 16, 2026

## Description

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 Products

- jm33-m0 — emp3r0r (< 4.2.5)

## References

- [CNA](https://github.com/jm33-m0/emp3r0r/security/advisories/GHSA-4595-rvpx-4q34)
- [CNA](https://github.com/jm33-m0/emp3r0r/releases/tag/v4.2.5)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.55%
- **EPSS Percentile:** 44.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._