CVE-2026-26201

emp3r0r Affected by Concurrent Map Access DoS (panic/crash)

Published Feb 19, 2026 CVSS 4.0 · 7 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-f5p9-j34q-pwcc emp3r0r Affected by Concurrent Map Access DoS (panic/crash)
History
Type Values Removed Values Added
CPEs cpe:2.3:a:jm33-m0:emp3r0r:*:*:*:*:*:*:*:*
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Type Values Removed Values Added
First Time appeared Jm33-m0
Jm33-m0 emp3r0r
Vendors & Products Jm33-m0
Jm33-m0 emp3r0r
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title emp3r0r Affected by Concurrent Map Access DoS (panic/crash)
Weaknesses CWE-362
CWE-663
References
Metrics cvssV4_0

{'score': 7, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Feb 19, 2026, 9:22 PM
Reserved
Feb 11, 2026, 7:56 PM
Status
Analyzed
Published
Feb 19, 2026, 8:25 PM
Modified
Jun 17, 2026, 10:25 AM