High
emp3r0r Affected by Concurrent Map Access DoS (panic/crash)
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-26201
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 10:52 UTC · Revision 1
Source evidence
emp3r0r Affected by Concurrent Map Access DoS (panic/crash)
core-osv · Original sourcePublished 19 Feb 2026, 19:21 UTC
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.
osv:CVE-2026-26201
Complete source record
{
"id": "d95bf761c62da209dc987277b5e703c44392c789a8eda7985013b91db5b5d9e1",
"url": "https://osv.dev/vulnerability/CVE-2026-26201",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "emp3r0r Affected by Concurrent Map Access DoS (panic/crash)",
"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.",
"evidence": "osv:CVE-2026-26201",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-26201",
"aliases": [
"CVE-2026-26201",
"GHSA-f5p9-j34q-pwcc",
"GO-2026-4504"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/jm33-m0/emp3r0r",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "88d8c0480db31ed4daa0e463aaace1c6d90c45c6"
},
{
"fixed": "ea4d074f081dac6293f3aec38f01def5f08d5af5"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:jm33-m0:emp3r0r:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "3.21.2"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "ea4d074f081dac6293f3aec38f01def5f08d5af5"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "88d8c0480db31ed4daa0e463aaace1c6d90c45c6"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v3.21.2"
}
]
}
}
],
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26201.json"
}
}
],
"modified": "2026-10-28T02:30:28.080883569Z",
"provider": "osv",
"references": [
"https://github.com/jm33-m0/emp3r0r/releases/tag/v3.21.2",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26201.json",
"https://github.com/jm33-m0/emp3r0r/security/advisories/GHSA-f5p9-j34q-pwcc",
"https://nvd.nist.gov/vuln/detail/CVE-2026-26201",
"https://github.com/jm33-m0/emp3r0r/commit/ea4d074f081dac6293f3aec38f01def5f08d5af5"
],
"provider_metadata": {
"cwe_ids": [
"CWE-362",
"CWE-663"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26201.json"
}
},
"related_cves": [
{
"value": "CVE-2026-26201",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 494666,
"published_at": "2026-02-19T19:21:05.691+00:00"
}