What’s Vulnerable › Vulnerabilities

CVE-2026-61554: emp3r0r has an unauthenticated HTTP Polling DoS

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-15 · updated 2026-09-30
• Weakness: CWE-400

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: before 4.2.5

References

• https://github.com/jm33-m0/emp3r0r/releases/tag/v4.2.5
• https://github.com/jm33-m0/emp3r0r/security/advisories/GHSA-4595-rvpx-4q34
• https://github.com/jm33-m0/emp3r0r/security/advisories/GHSA-4595-rvpx-4q34

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