ChatterBot has Denial of Service via Database Connection Pool Exhaustion

{
  "id": "75a50a556f2ac47b5b2ba0e36baad234b2f1091d4732fb041358e91c4dbe9360",
  "url": "https://osv.dev/vulnerability/CVE-2026-23842",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ChatterBot has Denial of Service via Database Connection Pool Exhaustion",
    "summary": "ChatterBot is a machine learning, conversational dialog engine for creating chat bots. ChatterBot versions up to 1.2.10 are vulnerable to a denial-of-service condition caused by improper database session and connection pool management. Concurrent invocations of the get_response() method can exhaust the underlying SQLAlchemy connection pool, resulting in persistent service unavailability and requiring a manual restart to recover. Version 1.2.11 fixes the issue.",
    "evidence": "osv:CVE-2026-23842",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-23842",
      "aliases": [
        "CVE-2026-23842",
        "GHSA-v4w8-49pv-mf72",
        "PYSEC-2026-1244"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/gunthercox/chatterbot",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "97181bde5546d112ef95eafda390aada68251d87"
                },
                {
                  "fixed": "de89fe648139f8eeacc998ad4524fab291a378cf"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:chatterbot:chatterbot:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.2.11"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "de89fe648139f8eeacc998ad4524fab291a378cf"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "97181bde5546d112ef95eafda390aada68251d87"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "1.2.11"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.2.10",
            "1.2.9",
            "1.2.8",
            "1.2.7",
            "1.2.6",
            "1.2.5",
            "1.2.4",
            "1.2.3",
            "1.2.2",
            "1.2.1",
            "1.2.0",
            "1.1.0a7",
            "1.0.6",
            "1.1.0a6",
            "1.1.0a5",
            "1.1.0a4",
            "1.1.0a3",
            "1.1.0a2",
            "1.1.0a1",
            "1.0.5",
            "1.0.4",
            "1.0.3",
            "1.0.2",
            "1.0.1",
            "1.0.0",
            "1.0.0a4",
            "1.0.0a3",
            "1.0.0a2",
            "1.0.0a1",
            "0.8.7",
            "0.8.6",
            "0.8.5",
            "0.8.4",
            "0.8.3",
            "0.8.2",
            "0.8.1",
            "0.8.0",
            "0.7.6",
            "0.7.5",
            "0.7.4",
            "0.7.3",
            "0.7.2",
            "0.7.1",
            "0.7.0",
            "0.6.3",
            "0.6.2",
            "0.6.1",
            "0.6.0",
            "0.5.5",
            "0.5.4",
            "0.5.3",
            "0.5.2",
            "0.5.1",
            "0.5.0",
            "0.4.14",
            "0.4.13",
            "0.4.12",
            "0.4.11",
            "0.4.10",
            "0.4.9",
            "0.4.8",
            "0.4.7",
            "0.4.6",
            "0.4.5",
            "0.4.4",
            "0.4.3",
            "0.4.2",
            "0.4.1",
            "0.4.0",
            "0.3.7",
            "0.3.6",
            "0.3.5",
            "0.3.4",
            "0.3.3",
            "0.3.2",
            "0.3.1",
            "0.3.0",
            "0.2.9",
            "0.2.8",
            "0.2.7",
            "0.2.6",
            "0.2.5",
            "0.2.4",
            "0.2.3",
            "0.2.2",
            "0.2.1",
            "0.2.0",
            "0.1.1",
            "0.1.0",
            "0.0.5",
            "0.0.4",
            "0.0.3",
            "0.0.2",
            "0.0.1",
            "0.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23842.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.094100175Z",
      "provider": "osv",
      "references": [
        "https://github.com/gunthercox/ChatterBot/releases/tag/1.2.11",
        "https://github.com/user-attachments/assets/4ee845c4-b847-4854-84ec-4b2fb2f7090f",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23842.json",
        "https://github.com/gunthercox/ChatterBot/security/advisories/GHSA-v4w8-49pv-mf72",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-23842",
        "https://github.com/gunthercox/ChatterBot/commit/de89fe648139f8eeacc998ad4524fab291a378cf",
        "https://github.com/gunthercox/ChatterBot/pull/2432"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-400"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23842.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-23842",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517332,
  "published_at": "2026-01-19T18:39:37.059+00:00"
}