Pillow: NULL dereference in ImagingExpand via rank filters on zero-size images

{
  "id": "aeb2fea9bab43f8289c2aa874ecad41765d5c0aa6b28f4eb2d3b3d5316a6613c",
  "url": "https://osv.dev/vulnerability/BIT-pillow-2026-112392",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Pillow: NULL dereference in ImagingExpand via rank filters on zero-size images",
    "summary": "Pillow is a Python imaging library. Prior to 13.0.0, Pillow's rank-based filters can dereference invalid image storage for a zero-size image. ImagingExpand() allocates a non-empty output and then faults while replicating edges by reading the first pixel from empty input storage; ImagingRankFilter is never reached. An attacker can supply or cause creation of a zero-size image to an application that applies a rank, median, minimum, or maximum filter. This causes a native process crash. This issue is fixed in version 13.0.0.",
    "evidence": "osv:BIT-pillow-2026-112392",
    "products": [
      {
        "name": {
          "value": "pillow",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "13.0.0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "BIT-pillow-2026-112392",
      "aliases": [
        "BIT-pillow-2026-112392",
        "CVE-2026-112392",
        "GHSA-27h8-gf7j-v5hc",
        "PYSEC-2026-4326"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "13.0.0"
                }
              ]
            }
          ],
          "package": {
            "name": "pillow",
            "purl": "pkg:bitnami/pillow",
            "ecosystem": "Bitnami"
          },
          "severity": [
            {
              "type": "CVSS_V4",
              "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
            }
          ],
          "database_specific": {
            "source": "https://github.com/bitnami/vulndb/tree/main/data/pillow/BIT-pillow-2026-112392.json"
          }
        }
      ],
      "modified": "2026-10-27T11:10:35.409737764Z",
      "provider": "osv",
      "references": [
        "https://github.com/python-pillow/Pillow/commit/443e3130a8c11594fd0e296afad497e11e678961",
        "https://github.com/python-pillow/Pillow/releases/tag/13.0.0",
        "https://github.com/python-pillow/Pillow/security/advisories/GHSA-27h8-gf7j-v5hc",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-112392"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:python:pillow:*:*:*:*:*:python:*:*"
        ],
        "severity": "High"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-112392",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 461506,
  "published_at": "2026-10-26T05:55:33.132+00:00"
}