HKUDS nanobot ExecTool shell.py ExecTool._spawn incomplete blacklist

{
  "id": "5d11d1512e58a3bc2d6d40bc6982f9a2a5ec4112e830382aad2048d8e1677d20",
  "url": "https://osv.dev/vulnerability/CVE-2026-90808",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "HKUDS nanobot ExecTool shell.py ExecTool._spawn incomplete blacklist",
    "summary": "A vulnerability was determined 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 ExecTool. This manipulation causes incomplete blacklist. It is possible to initiate the attack remotely. Patch name: af582246f141311d574551b7571a517bcc3df750. Applying a patch is the recommended action to fix this issue.",
    "evidence": "osv:CVE-2026-90808",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-90808",
      "aliases": [
        "CVE-2026-90808"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "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:X"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/hkuds/nanobot",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c018c3fb6a5cedf2dcd7bbd0bf4fce5eb9b54bf7"
                },
                {
                  "fixed": "af582246f141311d574551b7571a517bcc3df750"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.2.0"
                      },
                      {
                        "last_affected": "0.2.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0.2.1"
                      },
                      {
                        "last_affected": "0.2.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "fixed": "af582246f141311d574551b7571a517bcc3df750"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.2.0",
            "0.2.1",
            "v0.3.0",
            "v0.2.2",
            "v0.2.1",
            "v0.2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90808.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.320759436Z",
      "provider": "osv",
      "references": [
        "https://github.com/HKUDS/nanobot/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90808.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90808",
        "https://vuldb.com/cve/CVE-2026-90808",
        "https://vuldb.com/submit/922849",
        "https://vuldb.com/vuln/403310",
        "https://github.com/HKUDS/nanobot/issues/5305",
        "https://vuldb.com/vuln/403310/cti",
        "https://github.com/HKUDS/nanobot/commit/af582246f141311d574551b7571a517bcc3df750",
        "https://github.com/HKUDS/nanobot/pull/5345"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-183",
          "CWE-184"
        ],
        "cna_assigner": "VulDB",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90808.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-90808",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505744,
  "published_at": "2026-09-14T18:00:10.882+00:00"
}