Pillow: OOB Write with Invalid PSD Tile Extents (Integer Overflow)

{
  "id": "de95c4614d21ad9d45476cb5254c533ab25e4743013a776a05f9b5222be386a9",
  "url": "https://osv.dev/vulnerability/CVE-2026-42311",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Pillow: OOB Write with Invalid PSD Tile Extents (Integer Overflow)",
    "summary": "Pillow is a Python imaging library. From version 10.3.0 to before version 12.2.0, processing a malicious PSD file could lead to memory corruption, potentially resulting in a crash or arbitrary code execution. This issue has been patched in version 12.2.0.",
    "evidence": "osv:CVE-2026-42311",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-42311",
      "aliases": [
        "BIT-pillow-2026-42311",
        "CVE-2026-42311",
        "GHSA-pwv6-vv43-88gr",
        "PYSEC-2026-2252"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/python-pillow/pillow",
              "type": "GIT",
              "events": [
                {
                  "introduced": "5c89d88eee199ba53f64581ea39b6a1bc52feb1a"
                },
                {
                  "fixed": "3c41c095064200a02672d89cc5ff629eaf4b0d4f"
                },
                {
                  "fixed": "58f9a1d166dcb0c274807d4423522d205b0c35ea"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "10.3.0"
                      },
                      {
                        "fixed": "12.2.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "58f9a1d166dcb0c274807d4423522d205b0c35ea"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "3c41c095064200a02672d89cc5ff629eaf4b0d4f"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "12.2.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "12.1.0",
            "12.0.0",
            "11.3.0",
            "11.2.1",
            "11.1.0",
            "11.0.0",
            "10.4.0",
            "10.3.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42311.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.670951872Z",
      "provider": "osv",
      "references": [
        "https://github.com/python-pillow/Pillow/releases/tag/12.2.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42311.json",
        "https://github.com/python-pillow/Pillow/security/advisories/GHSA-pwv6-vv43-88gr",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-42311",
        "https://github.com/python-pillow/Pillow/commit/58f9a1d166dcb0c274807d4423522d205b0c35ea",
        "https://github.com/python-pillow/Pillow/pull/9520"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-190",
          "CWE-787"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42311.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-42311",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 510303,
  "published_at": "2026-05-09T04:11:58.092+00:00"
}