ImageSharp: TIFF CCITT T4 encoder can write past its compressed output buffer

{
  "id": "376efd0c85808c4fbb1da51c63d7d33fcd77abbcc37430b3c5da7cfb231d415d",
  "url": "https://osv.dev/vulnerability/CVE-2026-106110",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ImageSharp: TIFF CCITT T4 encoder can write past its compressed output buffer",
    "summary": "ImageSharp is a 2D graphics library. From 2.0.0 until 4.1.2, the TIFF CCITT Group 3 encoder allocates an undersized compressed-data buffer for narrow 1-bit images. TiffCcittCompressor.Initialize does not reserve enough space for the row data and T4 end-of-line codes, and T4BitCompressor.CompressStrip reaches unchecked writes when TiffCompression.CcittGroup3Fax is selected directly or inherited from decoded TIFF metadata. An attacker-controlled encode or decode-and-re-encode flow can write beyond the logical output span, corrupt process memory, and terminate the process. This issue is fixed in version 4.1.2.",
    "evidence": "osv:CVE-2026-106110",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-106110",
      "aliases": [
        "CVE-2026-106110",
        "GHSA-j9gm-c75j-xc9q"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/sixlabors/imagesharp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "5d6f3893baad0defd9d1a45b31275fedcd6a63e9"
                },
                {
                  "fixed": "baa37cd19077b2a2a0c5667535111cf31d48c019"
                },
                {
                  "introduced": "ff36e83c740e8049574eb468798151e96a176f12"
                },
                {
                  "fixed": "dee414097e4be7bb35ef0209cf96bd0b61a7133a"
                },
                {
                  "fixed": "a9498c6db3642ef92c712ebc81e706914ac16a95"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:sixlabors:imagesharp:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.0.0"
                      },
                      {
                        "fixed": "3.2.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:sixlabors:imagesharp:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.0.0"
                      },
                      {
                        "fixed": "4.1.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "a9498c6db3642ef92c712ebc81e706914ac16a95"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "dee414097e4be7bb35ef0209cf96bd0b61a7133a"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v4.1.2"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.1.1",
            "v4.1.0",
            "v4.0.0",
            "v3.1.12",
            "v3.1.11",
            "v3.1.10",
            "v3.1.9",
            "v3.1.8",
            "v3.1.7",
            "v3.1.6",
            "v3.1.5",
            "v3.1.4",
            "v3.1.3",
            "v3.1.2",
            "v3.1.1",
            "v3.1.0",
            "v3.0.1",
            "v3.0.0",
            "v2.1.1",
            "v2.1.0",
            "v2.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-106110.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.396329612Z",
      "provider": "osv",
      "references": [
        "https://github.com/SixLabors/ImageSharp/releases/tag/v4.1.2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106110.json",
        "https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-j9gm-c75j-xc9q",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-106110",
        "https://github.com/SixLabors/ImageSharp/commit/a9498c6db3642ef92c712ebc81e706914ac16a95",
        "https://github.com/SixLabors/ImageSharp/pull/3187"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-787"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106110.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-106110",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 513455,
  "published_at": "2026-10-06T17:42:02.099+00:00"
}