Vulnerability-Lookup

CVE-2026-26201 (GCVE-0-2026-26201)

Vulnerability from cvelistv5 – Published: 2026-02-19 19:21 – Updated: 2026-02-19 21:22

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.

Severity ?

7 (High)


                        
                          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

CWE

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-663 - Use of a Non-reentrant Function in a Concurrent Context

Assigner

GitHub_M

References

URL

Tags

	https://github.com/jm33-m0/emp3r0r/security/advis…	x_refsource_CONFIRM
	https://github.com/jm33-m0/emp3r0r/commit/ea4d074…	x_refsource_MISC
	https://github.com/jm33-m0/emp3r0r/releases/tag/v3.21.2	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	jm33-m0	emp3r0r	Affected: < 3.21.2

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-26201

Vulnerability from fkie_nvd - Published: 2026-02-19 20:25 - Updated: 2026-02-19 20:25

Severity ?

7.0 (High) - 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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/jm33-m0/emp3r0r/commit/ea4d074f081dac6293f3aec38f01def5f08d5af5
	security-advisories@github.com	https://github.com/jm33-m0/emp3r0r/releases/tag/v3.21.2
	security-advisories@github.com	https://github.com/jm33-m0/emp3r0r/security/advisories/GHSA-f5p9-j34q-pwcc

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "id": "CVE-2026-26201",
  "lastModified": "2026-02-19T20:25:42.770",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "HIGH",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.0,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
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          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "HIGH",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
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          "vulnConfidentialityImpact": "NONE",
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        },
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        "type": "Secondary"
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          "value": "CWE-362"
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}

GHSA-F5P9-J34Q-PWCC

Vulnerability from github – Published: 2026-02-17 21:27 – Updated: 2026-02-19 21:56

Summary

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

Details

Summary

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).

Vulnerable Component(with code examples)

Operator relay map had mixed access patterns (iteration and mutation without a single lock policy):

// vulnerable pattern (operator session map)
for sessionID, op := range OPERATORS { // iteration path
    ...
}

// concurrent mutation path elsewhere
OPERATORS[operatorSession] = &operator_t{...}
delete(OPERATORS, operatorSession)

Port-forwarding session map had read/write paths guarded inconsistently:

// vulnerable pattern (port forward map)
if sess, ok := PortFwds[id]; ok { // read path
    ...
}

PortFwds[id] = newSession // write path
delete(PortFwds, id)      // delete path

FTP stream map similarly mixed concurrent iteration with mutation:

// vulnerable pattern (FTP stream map)
for token, stream := range FTPStreams { // iteration path
    ...
}

FTPStreams[token] = stream // write path
delete(FTPStreams, token)  // delete path

Attack Vector

Attacker (or stress traffic in authenticated flows) triggers high concurrency in normal control paths.
Operator sessions connect/disconnect while message forwarding and file-transfer workflows are active.
Concurrent read/write hits shared maps.
Go runtime panics with concurrent map read/write error.
C2 component exits, producing denial of service.

Proof of Concept

Start C2 server with active operator session(s) in a lab environment.
Generate rapid operator session churn (connect/disconnect loops).
Simultaneously drive agent message tunnel traffic and/or file transfer activity.
Observe crash signature in logs: fatal error: concurrent map read and map write.
Optional: run with race detector in dev build to confirm race locations.

Impact

C2 service interruption due to process panic/crash.
Operational instability under load or deliberate churn.
Repeated crash-restart cycles can degrade command reliability and incident response workflows.

Severity ?

7.0 (High)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/jm33-m0/emp3r0r/core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20260212232424-ea4d074f081d"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-26201"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362",
      "CWE-663"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-17T21:27:58Z",
    "nvd_published_at": "2026-02-19T20:25:42Z",
    "severity": "HIGH"
  },
  "details": "## Summary\n\nMultiple 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).\n\n## Vulnerable Component(with code examples)\n\nOperator relay map had mixed access patterns (iteration and mutation without a single lock policy):\n\n```go\n// vulnerable pattern (operator session map)\nfor sessionID, op := range OPERATORS { // iteration path\n    ...\n}\n\n// concurrent mutation path elsewhere\nOPERATORS[operatorSession] = \u0026operator_t{...}\ndelete(OPERATORS, operatorSession)\n```\n\nPort-forwarding session map had read/write paths guarded inconsistently:\n\n```go\n// vulnerable pattern (port forward map)\nif sess, ok := PortFwds[id]; ok { // read path\n    ...\n}\n\nPortFwds[id] = newSession // write path\ndelete(PortFwds, id)      // delete path\n```\n\nFTP stream map similarly mixed concurrent iteration with mutation:\n\n```go\n// vulnerable pattern (FTP stream map)\nfor token, stream := range FTPStreams { // iteration path\n    ...\n}\n\nFTPStreams[token] = stream // write path\ndelete(FTPStreams, token)  // delete path\n```\n\n## Attack Vector\n\n1. Attacker (or stress traffic in authenticated flows) triggers high concurrency in normal control paths.\n2. Operator sessions connect/disconnect while message forwarding and file-transfer workflows are active.\n3. Concurrent read/write hits shared maps.\n4. Go runtime panics with concurrent map read/write error.\n5. C2 component exits, producing denial of service.\n\n## Proof of Concept\n\n1. Start C2 server with active operator session(s) in a lab environment.\n2. Generate rapid operator session churn (connect/disconnect loops).\n3. Simultaneously drive agent message tunnel traffic and/or file transfer activity.\n4. Observe crash signature in logs: `fatal error: concurrent map read and map write`.\n5. Optional: run with race detector in dev build to confirm race locations.\n\n## Impact\n\n- C2 service interruption due to process panic/crash.\n- Operational instability under load or deliberate churn.\n- Repeated crash-restart cycles can degrade command reliability and incident response workflows.",
  "id": "GHSA-f5p9-j34q-pwcc",
  "modified": "2026-02-19T21:56:27Z",
  "published": "2026-02-17T21:27:58Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/jm33-m0/emp3r0r/security/advisories/GHSA-f5p9-j34q-pwcc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26201"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jm33-m0/emp3r0r/commit/ea4d074f081dac6293f3aec38f01def5f08d5af5"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/jm33-m0/emp3r0r"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jm33-m0/emp3r0r/releases/tag/v3.21.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "emp3r0r Affected by Concurrent Map Access DoS (panic/crash)"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-26201 (GCVE-0-2026-26201)

FKIE_CVE-2026-26201

GHSA-F5P9-J34Q-PWCC

Summary

Vulnerable Component(with code examples)

Attack Vector

Proof of Concept

Impact

Tags

Sightings

Nomenclature