FKIE_CVE-2026-19243

Vulnerability from fkie_nvd - Published: 2026-08-07 20:16 - Updated: 2026-08-12 20:59
Severity
6.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Summary
A security vulnerability has been detected in HKUDS nanobot up to 0.2.1. Impacted is the function ExecTool._guard_command/ExecTool._spawn of the file nanobot/agent/tools/shell.py of the component Shell Allowlist Handler. Such manipulation leads to os command injection. The attack can be executed remotely. The exploit has been disclosed publicly and may be used. Upgrading to version 0.3.0 is recommended to address this issue. The name of the patch is 4562. It is advisable to upgrade the affected component. Multiple issues were reported to the project. They reacted with a high level of professionalism and kindness: "These five reports are variants of the same root cause: validation of shell commands containing multiple segments, wrappers, comments, or chained commands. The issue was fixed by validating every executable shell segment against the configured allowlist".
References
cna@vuldb.comhttps://gist.github.com/YLChen-007/8fcbf8e49e7be568e1a92e9e0414fdba
cna@vuldb.comhttps://github.com/HKUDS/nanobot/
cna@vuldb.comhttps://github.com/HKUDS/nanobot/issues/4521
cna@vuldb.comhttps://github.com/HKUDS/nanobot/pull/4562
cna@vuldb.comhttps://github.com/HKUDS/nanobot/releases/tag/v0.3.0
cna@vuldb.comhttps://vuldb.com/cve/CVE-2026-19243
cna@vuldb.comhttps://vuldb.com/submit/865112
cna@vuldb.comhttps://vuldb.com/submit/865114
cna@vuldb.comhttps://vuldb.com/submit/865115
cna@vuldb.comhttps://vuldb.com/submit/865119
cna@vuldb.comhttps://vuldb.com/submit/865121
cna@vuldb.comhttps://vuldb.com/vuln/386997
cna@vuldb.comhttps://vuldb.com/vuln/386997/cti
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:nanobot:nanobot:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "Shell Allowlist Handler"
          ],
          "product": "nanobot",
          "vendor": "HKUDS",
          "versions": [
            {
              "status": "affected",
              "version": "0.2.0"
            },
            {
              "status": "affected",
              "version": "0.2.1"
            },
            {
              "status": "unaffected",
              "version": "0.3.0"
            }
          ]
        }
      ],
      "source": "cna@vuldb.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A security vulnerability has been detected in HKUDS nanobot up to 0.2.1. Impacted is the function ExecTool._guard_command/ExecTool._spawn of the file nanobot/agent/tools/shell.py of the component Shell Allowlist Handler. Such manipulation leads to os command injection. The attack can be executed remotely. The exploit has been disclosed publicly and may be used. Upgrading to version 0.3.0 is recommended to address this issue. The name of the patch is 4562. It is advisable to upgrade the affected component. Multiple issues were reported to the project. They reacted with a high level of professionalism and kindness: \"These five reports are variants of the same root cause: validation of shell commands containing multiple segments, wrappers, comments, or chained commands. The issue was fixed by validating every executable shell segment against the configured allowlist\"."
    }
  ],
  "id": "CVE-2026-19243",
  "lastModified": "2026-08-12T20:59:21.023",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "SINGLE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 6.5,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:S/C:P/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 8.0,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "cna@vuldb.com",
        "type": "Secondary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 6.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.4,
        "source": "cna@vuldb.com",
        "type": "Secondary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 2.1,
          "baseSeverity": "LOW",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "PROOF_OF_CONCEPT",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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",
          "vulnAvailabilityImpact": "LOW",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "cna@vuldb.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-19243",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-11T01:10:00.887794Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-07T20:16:50.913",
  "references": [
    {
      "source": "cna@vuldb.com",
      "url": "https://gist.github.com/YLChen-007/8fcbf8e49e7be568e1a92e9e0414fdba"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://github.com/HKUDS/nanobot/"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://github.com/HKUDS/nanobot/issues/4521"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://github.com/HKUDS/nanobot/pull/4562"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://github.com/HKUDS/nanobot/releases/tag/v0.3.0"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://vuldb.com/cve/CVE-2026-19243"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://vuldb.com/submit/865112"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://vuldb.com/submit/865114"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://vuldb.com/submit/865115"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://vuldb.com/submit/865119"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://vuldb.com/submit/865121"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://vuldb.com/vuln/386997"
    },
    {
      "source": "cna@vuldb.com",
      "url": "https://vuldb.com/vuln/386997/cti"
    }
  ],
  "sourceIdentifier": "cna@vuldb.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-77"
        },
        {
          "lang": "en",
          "value": "CWE-78"
        }
      ],
      "source": "cna@vuldb.com",
      "type": "Secondary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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