{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "11.0.0"
                  },
                  {
                    "fixed": "13.0.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "fixed": "78d97d994579aef81aafe123773d525f40f2522a"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "13.0.0",
                "range": [
                  {
                    "fixed": "293218ad059d994baf1777d882911bed6a49704a"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "204aae6682fc936f5350b3fe70335776f81480a7"
            },
            {
              "fixed": "293218ad059d994baf1777d882911bed6a49704a"
            },
            {
              "fixed": "78d97d994579aef81aafe123773d525f40f2522a"
            }
          ],
          "repo": "https://github.com/python-pillow/pillow",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-v9pv-5gc8-w2m6"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-125",
      "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/96xxx/CVE-2026-96639.json"
  },
  "details": "Pillow is a Python imaging library. From 11.0.0 until 13.0.0, multi-frame loaders can retain an ImagingCore allocation created for a narrow frame mode while a later frame of the same dimensions changes the logical mode and decoder tiles to wider RGB or CMYK data. ImageFile.load_prepare() reuses the stale native storage because _im is non-null without verifying that its mode and size still match. Crafted PSD, MPO, DCX, or MIC frame transitions can then write wider pixels into the narrow allocation, causing native out-of-bounds writes and crashes. The MPO path can also cause a native over-read and, in demonstrated runtime-specific profiles, command execution. This issue is fixed in version 13.0.0.",
  "id": "CVE-2026-96639",
  "modified": "2026-10-23T02:30:56.440855285Z",
  "published": "2026-10-21T21:06:42.111Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/96xxx/CVE-2026-96639.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python-pillow/Pillow/commit/78d97d994579aef81aafe123773d525f40f2522a"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python-pillow/Pillow/pull/10105"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python-pillow/Pillow/releases/tag/13.0.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/python-pillow/Pillow/security/advisories/GHSA-v9pv-5gc8-w2m6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-96639"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Pillow multi-frame loaders can reuse stale native image storage after mode transitions"
}