picklescan - Arbitrary File Creation via logging.FileHandler Deserialization

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.

Problem type

Deserialization of Untrusted Data

Affected products

picklescan

picklescan

< 1.0.1 - AFFECTED

1.0.1 - UNAFFECTED

References

GHSA Advisory GHSA-m7j5-r2p5-c39r

https://github.com/mmaitre314/picklescan/security/advisories/GHSA-m7j5-r2p5-c39r

vendor-advisory

VulnCheck Advisory: picklescan - Arbitrary File Creation via logging.FileHandler Deserialization

https://www.vulncheck.com/advisories/picklescan-arbitrary-file-creation-via-logging-filehandler-deserialization

third-party-advisory

JSON source

https://cveawg.mitre.org/api/cve/CVE-2026-56304

Click to expand

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-56304",
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "dateUpdated": "2026-06-20T15:24:46.782Z",
    "dateReserved": "2026-06-20T12:53:19.893Z",
    "datePublished": "2026-06-20T15:24:46.782Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck",
        "dateUpdated": "2026-06-20T15:24:46.782Z"
      },
      "datePublic": "2026-02-02T00:00:00.000Z",
      "title": "picklescan - Arbitrary File Creation via logging.FileHandler Deserialization",
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "affected": [
        {
          "vendor": "picklescan",
          "product": "picklescan",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "1.0.1"
            },
            {
              "version": "1.0.1",
              "status": "unaffected",
              "versionType": "semver"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "Deserialization of Untrusted Data",
              "cweId": "CWE-502",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/mmaitre314/picklescan/security/advisories/GHSA-m7j5-r2p5-c39r",
          "name": "GHSA Advisory GHSA-m7j5-r2p5-c39r",
          "tags": [
            "vendor-advisory"
          ]
        },
        {
          "url": "https://www.vulncheck.com/advisories/picklescan-arbitrary-file-creation-via-logging-filehandler-deserialization",
          "name": "VulnCheck Advisory: picklescan - Arbitrary File Creation via logging.FileHandler Deserialization",
          "tags": [
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          ]
        }
      ],
      "metrics": [
        {
          "format": "CVSS"
        },
        {
          "format": "CVSS",
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
            "attackVector": "NETWORK",
            "attackComplexity": "LOW",
            "privilegesRequired": "NONE",
            "userInteraction": "NONE",
            "scope": "UNCHANGED",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "availabilityImpact": "LOW",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM"
          }
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "ez-lbz",
          "type": "reporter"
        }
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    }
  }
}