crawl4ai before 0.9.3 Arbitrary File Write via PDFContentScrapingStrategy

{
  "id": "3a8cb0236f33b9a1d39798580146e0cb8b24882060384992589219317ef6ae04",
  "url": "https://osv.dev/vulnerability/CVE-2026-91940",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "crawl4ai before 0.9.3 Arbitrary File Write via PDFContentScrapingStrategy",
    "summary": "crawl4ai before 0.9.3 contains an arbitrary file write vulnerability in PDFContentScrapingStrategy where the _filter_untrusted_fields function fails to validate untrusted configuration fields. Attackers can submit crafted config bodies with malicious image_save_dir paths to write attacker-controlled bytes into any directory accessible to the service account.",
    "evidence": "osv:CVE-2026-91940",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-91940",
      "aliases": [
        "CVE-2026-91940",
        "GHSA-xpp7-j28w-2gvx"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/unclecode/crawl4ai",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c66f3276fd355031c8632500911fe7041ad6fc14"
                },
                {
                  "fixed": "4bcd5fa8a56000ce103dd499e8ecdff2439f3e9c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.9.0"
                      },
                      {
                        "fixed": "0.9.3"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "4ai"
                      },
                      {
                        "fixed": "0.9.3"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.9.2",
            "docker-rebuild-v0.9.2",
            "v0.9.1",
            "docker-rebuild-v0.9.1",
            "v0.9.0",
            "docker-rebuild-v0.9.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-91940.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.383742817Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91940.json",
        "https://github.com/unclecode/crawl4ai/security/advisories/GHSA-xpp7-j28w-2gvx",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-91940",
        "https://www.vulncheck.com/advisories/crawl4ai-before-0.9.3-arbitrary-file-write-via-pdfcontentscrapingstrategy"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-22"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91940.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-91940",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492013,
  "published_at": "2026-09-15T15:18:01.074+00:00"
}