Security advisory

{
  "id": "03a03acd585430197d2cdbbd32ab55c3f6524484b437397f4779c33b831502a6",
  "url": "https://osv.dev/vulnerability/CVE-2021-24040",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-24040",
    "summary": "Due to use of unsafe YAML deserialization logic, an attacker with the ability to modify local YAML configuration files could provide malicious input, resulting in remote code execution or similar risks. This issue affects ParlAI prior to v1.1.0.",
    "evidence": "osv:CVE-2021-24040",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2021-24040",
      "aliases": [
        "CVE-2021-24040",
        "CVE-2021-39207",
        "GHSA-m87f-9fvv-2mgg",
        "GHSA-mwgj-7x7j-6966",
        "PYSEC-2021-330",
        "PYSEC-2021-334"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/facebookresearch/parlai",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "7092d77796ae23a4b606b8e61aee7c817747add7"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:facebook:parlai:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.1.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "7092d77796ae23a4b606b8e61aee7c817747add7"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.1.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.0.0",
            "final_mturk",
            "qa_data_collection",
            "v0.10.0",
            "acute_eval",
            "turn_annotations",
            "react_task_demo",
            "qualification_flow_example",
            "v0.9.4",
            "v0.9.3",
            "mturk_archive",
            "v0.9.2",
            "v0.9.1",
            "v0.9.0",
            "v0.8.0",
            "memnn_feedback",
            "mastering_the_dungeon",
            "v0.1.20200716",
            "v0.1.20200416",
            "v0.1.20200409",
            "convai2archive",
            "talkthewalk",
            "personachat"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-24040.json"
          }
        }
      ],
      "modified": "2026-10-20T10:53:38.945270323Z",
      "provider": "osv",
      "references": [
        "https://github.com/facebookresearch/ParlAI/releases/tag/v1.1.0",
        "https://github.com/facebookresearch/ParlAI/security/advisories/GHSA-m87f-9fvv-2mgg"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-24040",
        "evidence": "/id"
      },
      {
        "value": "CVE-2021-39207",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384460,
  "published_at": "2021-09-10T22:15:07.443+00:00"
}