Vulnerability in Jm33-M0 Emp3r0r
CVE-2026-26201
emp3r0r is a C2 designed by Linux users for Linux environments. Prior to version 3.21.2, multiple shared maps are accessed without consistent synchronization across goroutines. Under concurrent activity, Go runtime can trigger `fatal error: concurrent map read and map write`, causing C2 process crash (availability loss). Version 3.21.2 fixes this issue.
Vulnerability class: Race Condition
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.005 (37.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Jm33-M0 Emp3r0r — versions < 3.21.2
Weakness classification (CWE)
References
- github.com/jm33-m0/emp3r0r/security/advisories/GHSA-f5p9-j34q-pwcc (Exploit, Vendor Advisory)
- github.com/jm33-m0/emp3r0r/commit/ea4d074f081dac6293f3aec38f01def5f08d5af5 (Patch)
- github.com/jm33-m0/emp3r0r/releases/tag/v3.21.2 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-26201?
- CVE-2026-26201 is a high-severity vulnerability in Jm33-M0 Emp3r0r, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.5/10. Published 2026-02-19.
- How severe is CVE-2026-26201?
- High severity. CVSS v3 base score is 7.5 out of 10.