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    CVE-2026-55798 (GCVE-0-2026-55798)

    Vulnerability from cvelistv5 – Published: 2026-07-06 18:44 – Updated: 2026-07-07 15:19
    VLAI
    Title
    Pillow: WindowsViewer.get_command() OS command injection via unescaped shell path
    Summary
    Pillow is a Python imaging library. Prior to 12.3.0, WindowsViewer.get_command() constructed a cmd.exe shell command by directly embedding a file path into an f-string without escaping and passed the result to subprocess.Popen(..., shell=True), allowing shell metacharacters in the file path to inject arbitrary cmd.exe commands. This issue is fixed in version 12.3.0.
    Severity
    4.5 (Medium)
    CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
    Assigner
    References
    Impacted products
    Vendor Product Version
    python-pillow Pillow Affected: < 12.3.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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              "content": {
                "id": "CVE-2026-55798",
                "options": [
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                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-07T15:19:30.348707Z",
                "version": "2.0.3"
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        "providerMetadata": {
          "dateUpdated": "2026-07-07T15:19:40.072Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
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            "tags": [
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            ],
            "url": "https://github.com/python-pillow/Pillow/security/advisories/GHSA-4x4j-2g7c-83w6"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Pillow",
          "vendor": "python-pillow",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 12.3.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Pillow is a Python imaging library. Prior to 12.3.0, WindowsViewer.get_command() constructed a cmd.exe shell command by directly embedding a file path into an f-string without escaping and passed the result to subprocess.Popen(..., shell=True), allowing shell metacharacters in the file path to inject arbitrary cmd.exe commands. This issue is fixed in version 12.3.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "LOW",
            "baseScore": 4.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
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              "cweId": "CWE-78",
              "description": "CWE-78: Improper Neutralization of Special Elements used in an OS Command (\u0027OS Command Injection\u0027)",
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-06T18:44:38.441Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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      },
      "references": [
        {
          "name": "https://github.com/python-pillow/Pillow/security/advisories/GHSA-4x4j-2g7c-83w6",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/python-pillow/Pillow/security/advisories/GHSA-4x4j-2g7c-83w6"
        },
        {
          "name": "https://github.com/python-pillow/Pillow/commit/8404ea5fe5df40fc34aa1e51403dd6fce0778b8a",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/python-pillow/Pillow/commit/8404ea5fe5df40fc34aa1e51403dd6fce0778b8a"
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        {
          "name": "https://github.com/python-pillow/Pillow/commit/88194166691b7b603529b8b036ab3ab9cedd2de4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/python-pillow/Pillow/commit/88194166691b7b603529b8b036ab3ab9cedd2de4"
        },
        {
          "name": "https://github.com/python-pillow/Pillow/commit/b0e06caa64c1405aa3da0bb1d2bd9a77ca22de7f",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/python-pillow/Pillow/commit/b0e06caa64c1405aa3da0bb1d2bd9a77ca22de7f"
        },
        {
          "name": "https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst"
        }
      ],
      "source": {
        "advisory": "GHSA-4x4j-2g7c-83w6",
        "discovery": "UNKNOWN"
      },
      "title": "Pillow: WindowsViewer.get_command() OS command injection via unescaped shell path"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-55798",
    "datePublished": "2026-07-06T18:44:38.441Z",
    "dateReserved": "2026-06-17T14:40:28.381Z",
    "dateUpdated": "2026-07-07T15:19:40.072Z",
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    PYSEC-2026-2257

    Vulnerability from pysec - Published: 2026-07-06 19:17 - Updated: 2026-07-13 05:50
    VLAI
    Details

    Pillow is a Python imaging library. Prior to 12.3.0, WindowsViewer.get_command() constructed a cmd.exe shell command by directly embedding a file path into an f-string without escaping and passed the result to subprocess.Popen(..., shell=True), allowing shell metacharacters in the file path to inject arbitrary cmd.exe commands. This issue is fixed in version 12.3.0.

    Severity
    4.5 (Medium)
    CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
    Impacted products
    Name purl
    pillow pkg:pypi/pillow
    Aliases
    To clipboard 

    {
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "PyPI",
        "name": "pillow",
        "purl": "pkg:pypi/pillow"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "12.3.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0",
        "1.1",
        "1.2",
        "1.3",
        "1.4",
        "1.5",
        "1.6",
        "1.7.0",
        "1.7.1",
        "1.7.2",
        "1.7.3",
        "1.7.4",
        "1.7.5",
        "1.7.6",
        "1.7.7",
        "1.7.8",
        "10.0.0",
        "10.0.1",
        "10.1.0",
        "10.2.0",
        "10.3.0",
        "10.4.0",
        "11.0.0",
        "11.1.0",
        "11.2.1",
        "11.3.0",
        "12.0.0",
        "12.1.0",
        "12.1.1",
        "12.2.0",
        "2.0.0",
        "2.1.0",
        "2.2.0",
        "2.2.1",
        "2.2.2",
        "2.3.0",
        "2.3.1",
        "2.3.2",
        "2.4.0",
        "2.5.0",
        "2.5.1",
        "2.5.2",
        "2.5.3",
        "2.6.0",
        "2.6.1",
        "2.6.2",
        "2.7.0",
        "2.8.0",
        "2.8.1",
        "2.8.2",
        "2.9.0",
        "3.0.0",
        "3.1.0",
        "3.1.0.rc1",
        "3.1.0rc1",
        "3.1.1",
        "3.1.2",
        "3.2.0",
        "3.3.0",
        "3.3.1",
        "3.3.2",
        "3.3.3",
        "3.4.0",
        "3.4.1",
        "3.4.2",
        "4.0.0",
        "4.1.0",
        "4.1.1",
        "4.2.0",
        "4.2.1",
        "4.3.0",
        "5.0.0",
        "5.1.0",
        "5.2.0",
        "5.3.0",
        "5.4.0",
        "5.4.0.dev0",
        "5.4.1",
        "6.0.0",
        "6.1.0",
        "6.2.0",
        "6.2.1",
        "6.2.2",
        "7.0.0",
        "7.1.0",
        "7.1.1",
        "7.1.2",
        "7.2.0",
        "8.0.0",
        "8.0.1",
        "8.1.0",
        "8.1.1",
        "8.1.2",
        "8.2.0",
        "8.3.0",
        "8.3.1",
        "8.3.2",
        "8.4.0",
        "9.0.0",
        "9.0.1",
        "9.1.0",
        "9.1.1",
        "9.2.0",
        "9.3.0",
        "9.4.0",
        "9.5.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55798",
    "GHSA-4x4j-2g7c-83w6"
  ],
  "details": "Pillow is a Python imaging library. Prior to 12.3.0, WindowsViewer.get_command() constructed a cmd.exe shell command by directly embedding a file path into an f-string without escaping and passed the result to subprocess.Popen(..., shell=True), allowing shell metacharacters in the file path to inject arbitrary cmd.exe commands. This issue is fixed in version 12.3.0.",
  "id": "PYSEC-2026-2257",
  "modified": "2026-07-13T05:50:46.495346Z",
  "published": "2026-07-06T19:17:08.830Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python-pillow/Pillow/commit/8404ea5fe5df40fc34aa1e51403dd6fce0778b8a"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python-pillow/Pillow/commit/88194166691b7b603529b8b036ab3ab9cedd2de4"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python-pillow/Pillow/commit/b0e06caa64c1405aa3da0bb1d2bd9a77ca22de7f"
    },
    {
      "type": "EVIDENCE",
      "url": "https://github.com/python-pillow/Pillow/security/advisories/GHSA-4x4j-2g7c-83w6"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    }
  ]
}