{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "fixed": "13.0.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "fixed": "7cb0e02389d8aac2a60896a490f572db0b07b841"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "13.0.0",
                "range": [
                  {
                    "fixed": "293218ad059d994baf1777d882911bed6a49704a"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "293218ad059d994baf1777d882911bed6a49704a"
            },
            {
              "fixed": "7cb0e02389d8aac2a60896a490f572db0b07b841"
            }
          ],
          "repo": "https://github.com/python-pillow/pillow",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-g842-9rc4-69pw"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-400",
      "CWE-409"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/96xxx/CVE-2026-96637.json"
  },
  "details": "Pillow is a Python imaging library. Prior to 13.0.0, SpiderImageFile.seek() in src/PIL/SpiderImagePlugin.py reparses a later SPIDER stack frame and replaces self._size without rerunning Image._decompression_bomb_check(). A tiny file can use a safe first frame to pass Image.open() and then declare very large dimensions in a later mode F frame. Loading that frame allocates approximately four bytes per attacker-declared pixel and can consume multiple gigabytes of memory. This issue is fixed in version 13.0.0.",
  "id": "CVE-2026-96637",
  "modified": "2026-10-23T02:31:01.712296617Z",
  "published": "2026-10-21T21:01:20.249Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/96xxx/CVE-2026-96637.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python-pillow/Pillow/commit/7cb0e02389d8aac2a60896a490f572db0b07b841"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python-pillow/Pillow/pull/10076"
    },
    {
      "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-g842-9rc4-69pw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-96637"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Pillow: Decompression bomb check bypass in SpiderImagePlugin.seek() leads to unbounded allocation DoS"
}