emp3r0r Affected by Concurrent Map Access DoS (panic/crash)
Priority LOW 31CWE-362Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- Present
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00332 26th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed emp3r0r (jm33-m0): 3.21.2github.com/jm33-m0/emp3r0r/core (Go): 0.0.0-20260212232424-ea4d074f081d
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| jm33-m0 | emp3r0r | before 3.21.2 | 3.21.2 | Patch available | CNA |
| — | github.com/jm33-m0/emp3r0r/core (Go) | before 0.0.0-20260212232424-ea4d074f081d | 0.0.0-20260212232424-ea4d074f081d | Patch available | GHSA-f5p9-j34q-pwcc |
- emp3r0r Vendorjm33-m0 Affected before 3.21.2 Fixed in 3.21.2 Patch available CNA
- github.com/jm33-m0/emp3r0r/core (Go) Vendor— Affected before 0.0.0-20260212232424-ea4d074f081d Fixed in 0.0.0-20260212232424-ea4d074f081d Patch available GHSA-f5p9-j34q-pwcc
Remediation
- Fix · CNA emp3r0r (jm33-m0) Fixed in 3.21.2
- Fix · GHSA-f5p9-j34q-pwcc github.com/jm33-m0/emp3r0r/core (Go) Fixed in 0.0.0-20260212232424-ea4d074f081d Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-26201
- 2026-10-03 Alias added: GHSA-f5p9-j34q-pwcc
References
More jm33-m0 Emp3r0r vulnerabilities
- TI-2026-21072 emp3r0r Agent-Controlled Metadata to Operator RCE (tmux Command Injection) CVSS 4.0CRITICAL 9.3
Sources
- CVE-2026-26201 · CVE Program
- CVE-2026-26201 · NVD
- FIRST EPSS
- GHSA-f5p9-j34q-pwcc · GitHub Advisory Database · CC BY 4.0
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