picklescan - Arbitrary File Creation via logging.FileHandler Deserialization

{
  "id": "18b1275a752d703671cf457fd1a966433d1485d0e7ddf2cd9eb9910741aa0eac",
  "url": "https://osv.dev/vulnerability/CVE-2026-56304",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "picklescan - Arbitrary File Creation via logging.FileHandler Deserialization",
    "summary": "picklescan before 1.0.1 contains an unsafe pickle deserialization vulnerability allowing unauthenticated attackers to create arbitrary zero-byte files via logging.FileHandler class instantiation. Attackers can exploit this by crafting malicious pickle payloads to bypass RCE blocklists and create lock files or other filesystem artifacts, potentially causing denial of service or application disruption.",
    "evidence": "osv:CVE-2026-56304",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-56304",
      "aliases": [
        "CVE-2026-56304",
        "GHSA-m7j5-r2p5-c39r",
        "PYSEC-2026-225"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mmaitre314/picklescan",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4d9bc9cd34bca8672dad3481cd4556d5ba747156"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.0.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "cpe": "cpe:2.3:a:mmaitre314:picklescan:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.0.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.0.0",
            "v0.0.35",
            "v0.0.34",
            "v0.0.33",
            "v0.0.32",
            "v0.0.31",
            "v0.0.30",
            "v0.0.29",
            "v0.0.28",
            "v0.0.27",
            "v0.0.26",
            "v0.0.25",
            "v0.0.24",
            "v0.0.23",
            "v0.0.22",
            "v0.0.21",
            "v0.0.20",
            "v0.0.19",
            "v0.0.18",
            "v0.0.17",
            "v0.0.15",
            "v0.0.14",
            "v0.0.13",
            "v0.0.12",
            "v0.0.11",
            "v0.0.10",
            "v0.0.9",
            "v0.0.8",
            "v0.0.7",
            "v0.0.6",
            "v0.0.5",
            "v0.0.4",
            "v0.0.3",
            "v0.0.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56304.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.053388852Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56304.json",
        "https://github.com/mmaitre314/picklescan/security/advisories/GHSA-m7j5-r2p5-c39r",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-56304",
        "https://www.vulncheck.com/advisories/picklescan-arbitrary-file-creation-via-logging-filehandler-deserialization"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-502"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56304.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-56304",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519850,
  "published_at": "2026-06-20T15:24:46.782+00:00"
}