{"cve":"CVE-2026-61554","nvd":{"published":"2026-09-15T21:16:41.223","modified":"2026-09-30T17:51:56.193","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400"],"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"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:54:41.405518556+00:00"},"epss":{"cve":"CVE-2026-61554","score":0.00707,"percentile":0.53167,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-4595-rvpx-4q34","url":"https://osv.dev/vulnerability/GHSA-4595-rvpx-4q34","summary":"emp3r0r has an unauthenticated HTTP Polling DoS","modified":"2026-09-28T17:10:43.770059304Z","packages":[{"ecosystem":"Go","name":"github.com/jm33-m0/emp3r0r/core","purl":"pkg:golang/github.com/jm33-m0/emp3r0r/core","ranges":["<0.0.0-20260531142011-aed3d81641ab"],"fixed":["0.0.0-20260531142011-aed3d81641ab"]}]},{"id":"GO-2026-6487","url":"https://osv.dev/vulnerability/GO-2026-6487","summary":"emp3r0r has an unauthenticated HTTP Polling DoS in github.com/jm33-m0/emp3r0r/core","modified":"2026-09-28T17:00:16.548335797Z","packages":[{"ecosystem":"Go","name":"github.com/jm33-m0/emp3r0r/core","purl":"pkg:golang/github.com/jm33-m0/emp3r0r/core","ranges":["<0.0.0-20260531142011-aed3d81641ab"],"fixed":["0.0.0-20260531142011-aed3d81641ab"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}