Resource exhaustion in Jm33-M0 Emp3r0r
CVE-2026-61554
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.
Vulnerability class: DoS (Denial of Service)
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Jm33-m0 Emp3r0r — versions < 4.2.5
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-61554?
- CVE-2026-61554 is a high-severity vulnerability in Jm33-M0 Emp3r0r, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-09-15.
- How severe is CVE-2026-61554?
- High severity. CVSS v3 base score is 7.5 out of 10.