agentverus-scanner Companion Code Analysis Bypass via Excluded Python Bytecode

{
  "id": "5f3c35c2a62f32382ad4749c98b987dd25f173cee0145027d0970ce67c197bcb",
  "url": "https://osv.dev/vulnerability/CVE-2026-84811",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "agentverus-scanner Companion Code Analysis Bypass via Excluded Python Bytecode",
    "summary": "agentverus-scanner fails to analyze compiled Python bytecode files in companion code directories, allowing attackers to bypass security scanning by shipping malicious __pycache__ entries alongside benign source files. Attackers can execute arbitrary Python bytecode on import while the scanner reports a CERTIFIED verdict with high trust scores in both static and semantic analysis modes.",
    "evidence": "osv:CVE-2026-84811",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-84811",
      "aliases": [
        "CVE-2026-84811"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/agentverus/agentverus-scanner",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "8c8636e4c72e518b4755a593831cb079e8ba69d2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.8.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.8.1",
            "agentverus-scanner-mcp@0.1.2",
            "v0.8.0",
            "v0.7.0",
            "v0.6.2",
            "v0.6.1",
            "v0.6.0",
            "v0.5.0",
            "v0.4.0",
            "v0.3.0",
            "v0.2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-84811.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.155901293Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84811.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-84811",
        "https://www.vulncheck.com/advisories/agentverus-scanner-companion-code-analysis-bypass-via-excluded-python-bytecode",
        "https://github.com/agentverus/agentverus-scanner/issues/27",
        "https://github.com/agentverus/agentverus-scanner",
        "https://github.com/agentverus/agentverus-scanner/blob/v0.8.1/src/scanner/analyzers/semantic.ts",
        "https://github.com/agentverus/agentverus-scanner/blob/v0.8.1/src/scanner/companion-code.ts"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-693"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84811.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-84811",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517531,
  "published_at": "2026-09-02T16:59:50.188+00:00"
}