ImageSharp: EXR ZIP decoder can expose stale allocator data after a short inflate

{
  "id": "a4b0164a79bf4a692198ea248adb8009f17221e89904b827b71d24558f864c83",
  "url": "https://osv.dev/vulnerability/GHSA-4q3p-rj5x-xv7p",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ImageSharp: EXR ZIP decoder can expose stale allocator data after a short inflate",
    "summary": "## Summary A crafted ZIP-compressed OpenEXR image can return stale memory from a prior ImageSharp operation as decoded pixels. The ZIP decoder accepts a non-empty inflate result shorter than the EXR block's required size, then the EXR decoder reads the full expected block. This is a process-local, cross-operation information-disclosure defect. It is relevant when an application uses the shared `Configuration.Default` allocator for separate image operations and exposes pixels or output derived from a later attacker-controlled EXR decode. Whether that creates a network attack path depends on the host application. No active exploitation is known. ## Affected package and versions - Package: `SixLabors.ImageSharp` (NuGet) - Affected published releases: **4.0.0, 4.1.0, and 4.1.1** - Affected range: `>= 4.0.0, <= 4.1.1` - Commit `0815358f9202a78bc7f3b83e19282dc3654b500f` corresponds to release **v4.1.1**. EXR support first appears in v4.0.0. The cross-operation PoC exposes the prior-operation marker on each published 4.x release, while the full-inflate control does not expose it on any of them. ## Details For ZIP/ZIPS EXR compression, [`ExrDecoderCore`](https://github.com/SixLabors/ImageSharp/blob/0815358f9202a78bc7f3b83e19282dc3654b500f/src/ImageSharp/Formats/Exr/ExrDecoderCore.cs#L169-L205) allocates the expected block buffer without `AllocationOptions.Clean` and later interprets the complete buffer as channel data. [`ZipExrCompression`](https://github.com/SixLabors/ImageSharp/blo",
    "evidence": "osv:GHSA-4q3p-rj5x-xv7p",
    "products": [
      {
        "name": {
          "value": "SixLabors.ImageSharp",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.1.2",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "4.0.0",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.1.0",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.1.1",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "GHSA-4q3p-rj5x-xv7p",
      "aliases": [
        "CVE-2026-106111",
        "GHSA-4q3p-rj5x-xv7p"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.0.0"
                },
                {
                  "fixed": "4.1.2"
                }
              ]
            }
          ],
          "package": {
            "name": "SixLabors.ImageSharp",
            "purl": "pkg:nuget/SixLabors.ImageSharp",
            "ecosystem": "NuGet"
          },
          "versions": [
            "4.0.0",
            "4.1.0",
            "4.1.1"
          ],
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-4q3p-rj5x-xv7p/GHSA-4q3p-rj5x-xv7p.json",
            "last_known_affected_version_range": "<= 4.1.1"
          }
        }
      ],
      "modified": "2026-10-07T20:30:07.092251615Z",
      "provider": "osv",
      "references": [
        "https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-4q3p-rj5x-xv7p",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-106111",
        "https://github.com/SixLabors/ImageSharp/pull/3187",
        "https://github.com/SixLabors/ImageSharp/commit/3c43cf583fdd98eff0f451397affaa31c6a2e6b1",
        "https://github.com/SixLabors/ImageSharp/commit/6ed2a275217d39301e76df42acec2a9533b39d2b",
        "https://github.com/SixLabors/ImageSharp",
        "https://github.com/SixLabors/ImageSharp/releases/tag/v4.1.2"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-226"
        ],
        "severity": "MODERATE",
        "github_reviewed": true,
        "nvd_published_at": "2026-10-06T18:16:52Z",
        "github_reviewed_at": "2026-10-07T20:24:42Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-106111",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 97240,
  "published_at": "2026-10-07T20:24:42+00:00"
}