Vulnerability-Lookup

GHSA-GVGJ-R6PG-M42W

Vulnerability from github – Published: 2026-09-02 18:32 – Updated: 2026-09-02 21:32

Details

claude-skill-antivirus fails to analyze executable files when scanning local skill directories, reading only SKILL.md while ignoring Python source, bytecode, and other artifacts in the scripts directory. Attackers can distribute skills with malicious code in non-manifest files that receive a SAFE verdict with 100/100 trust score despite containing unanalyzed executable payloads.

Severity

6.5 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

7.1 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-84810"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-693"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-02T17:18:05Z",
    "severity": "HIGH"
  },
  "details": "claude-skill-antivirus fails to analyze executable files when scanning local skill directories, reading only SKILL.md while ignoring Python source, bytecode, and other artifacts in the scripts directory. Attackers can distribute skills with malicious code in non-manifest files that receive a SAFE verdict with 100/100 trust score despite containing unanalyzed executable payloads.",
  "id": "GHSA-gvgj-r6pg-m42w",
  "modified": "2026-09-02T21:32:06Z",
  "published": "2026-09-02T18:32:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84810"
    },
    {
      "type": "WEB",
      "url": "https://github.com/claude-world/claude-skill-antivirus/issues/33"
    },
    {
      "type": "WEB",
      "url": "https://github.com/claude-world/claude-skill-antivirus"
    },
    {
      "type": "WEB",
      "url": "https://github.com/claude-world/claude-skill-antivirus/blob/v2.1.3/src/scanner/index.js"
    },
    {
      "type": "WEB",
      "url": "https://github.com/claude-world/claude-skill-antivirus/blob/v2.1.3/src/utils/downloader.js"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nedlir/skills-scanner-bypass"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/claude-skill-antivirus-analysis-bypass-via-manifest-only-local-directory-scan"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/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",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-84810 (GCVE-0-2026-84810)

Vulnerability from cvelistv5 – Published: 2026-09-02 16:59 – Updated: 2026-09-02 18:02

Title

claude-skill-antivirus Analysis Bypass via Manifest-Only Local Directory Scan

Summary

Severity

7.1 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-02 18:02 UTC

CWE

CWE-693 - Protection Mechanism Failure

Assigner

VulnCheck mitre root

References

6 references

URL	Tags
https://github.com/claude-world/claude-skill-anti…	issue-tracking
https://github.com/claude-world/claude-skill-anti…	technical-description
https://github.com/claude-world/claude-skill-anti…	technical-description
https://github.com/claude-world/claude-skill-antivirus	product
https://www.vulncheck.com/advisories/claude-skill…	third-party-advisory
https://github.com/nedlir/skills-scanner-bypass	exploit

Impacted products

1 product

Vendor	Product	Version
claude-world	claude-skill-antivirus	Affected: 0 , ≤ 2.1.3 (semver)

Date Public

2026-08-10 00:00

Credits

nedlir

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-84810",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-02T18:02:03.730786Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-02T18:02:22.959Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/nedlir/skills-scanner-bypass"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:npm/claude-skill-antivirus",
          "product": "claude-skill-antivirus",
          "vendor": "claude-world",
          "versions": [
            {
              "lessThanOrEqual": "2.1.3",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "nedlir"
        }
      ],
      "datePublic": "2026-08-10T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "claude-skill-antivirus fails to analyze executable files when scanning local skill directories, reading only SKILL.md while ignoring Python source, bytecode, and other artifacts in the scripts directory. Attackers can distribute skills with malicious code in non-manifest files that receive a SAFE verdict with 100/100 trust score despite containing unanalyzed executable payloads."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "HIGH"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-693",
              "description": "Protection Mechanism Failure",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-02T16:59:49.506Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "GitHub Issue #33",
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/claude-world/claude-skill-antivirus/issues/33"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/claude-world/claude-skill-antivirus/blob/v2.1.3/src/utils/downloader.js"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/claude-world/claude-skill-antivirus/blob/v2.1.3/src/scanner/index.js"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/claude-world/claude-skill-antivirus"
        },
        {
          "name": "VulnCheck Advisory: claude-skill-antivirus Analysis Bypass via Manifest-Only Local Directory Scan",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/claude-skill-antivirus-analysis-bypass-via-manifest-only-local-directory-scan"
        }
      ],
      "title": "claude-skill-antivirus Analysis Bypass via Manifest-Only Local Directory Scan",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-84810",
    "datePublished": "2026-09-02T16:59:49.506Z",
    "dateReserved": "2026-09-02T10:19:32.992Z",
    "dateUpdated": "2026-09-02T18:02:22.959Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-GVGJ-R6PG-M42W

CVE-2026-84810 (GCVE-0-2026-84810)

Tags

Sightings

Nomenclature