Excelize Decrypt: unrecoverable panics on malformed OLE/CFB encrypted workbooks

{
  "id": "d895e35bc5fa322252772dc927a9b1e590bd85e252cd34a8400023fe490a1022",
  "url": "https://osv.dev/vulnerability/GHSA-2j4c-ffch-9f23",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Excelize Decrypt: unrecoverable panics on malformed OLE/CFB encrypted workbooks",
    "summary": "### Summary Any file whose first 8 bytes are the OLE compound-file signature (`D0 CF 11 E0 A1 B1 1A E1`) is routed by `OpenFile`/`OpenReader`/`OpenBytes` → `openReaderAt` → `Decrypt`. The version dispatch only guarantees `len(EncryptionInfo) >= 4` before handing attacker-controlled `EncryptionInfo`/`EncryptedPackage` buffers to `standardDecrypt`/`agileDecrypt`, and no callee validates structure. Malformed but version-valid content therefore fails as an **unrecovered runtime panic** instead of an error, terminating the calling process. ### Details All panic classes below were execution-confirmed against pristine master (`ecd99d761fe0`, 2026-09-08). `excelize.go:211-213` maps `Decrypt` *errors* to `ErrWorkbookFileFormat`, but panics bypass that path and kill the process. | # | Malformed input | Panic | Site | |---|---|---|---| | 1 | standard, `len(EncryptionInfo)` 4–11 | slice bounds `[:12]` | `crypt.go:238` | | 2 | standard, attacker-controlled `headerSize` uint32 | slice bounds `[12:12+headerSize]` / fixed-offset header reads | `crypt.go:238-249` | | 3 | standard, verifier remainder < 72 (AES) / 60 (RC4) bytes | slice bounds in `standardEncryptionVerifier` | `crypt.go:282-295` | | 4 | standard, `header.KeySize` = 0xFFFFFFFF | slice bounds `[:536870911]` with capacity 48 | `crypt.go:321` | | 5 | standard, `EncryptedPackage` stream missing/short | slice bounds `[8:0]` | `crypt.go:268` | | 6 | agile, `len(EncryptionInfo)` 4–7 | slice bounds `[8:4]` | `crypt.go:407` | | 7 | agile",
    "evidence": "osv:GHSA-2j4c-ffch-9f23",
    "products": [
      {
        "name": {
          "value": "github.com/xuri/excelize/v2",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.11.1-0.20260915055537-22f76f9acb94",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "GHSA-2j4c-ffch-9f23",
      "aliases": [
        "CVE-2026-107214",
        "GHSA-2j4c-ffch-9f23",
        "GO-2026-6684"
      ],
      "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": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "2.3.1"
                },
                {
                  "fixed": "2.11.1-0.20260915055537-22f76f9acb94"
                }
              ]
            }
          ],
          "package": {
            "name": "github.com/xuri/excelize/v2",
            "purl": "pkg:golang/github.com/xuri/excelize/v2",
            "ecosystem": "Go"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-2j4c-ffch-9f23/GHSA-2j4c-ffch-9f23.json"
          }
        }
      ],
      "modified": "2026-10-19T21:40:56.735377549Z",
      "provider": "osv",
      "references": [
        "https://github.com/qax-os/excelize/security/advisories/GHSA-2j4c-ffch-9f23",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-107214",
        "https://github.com/qax-os/excelize/pull/2395",
        "https://github.com/qax-os/excelize/commit/22f76f9acb94b85b3eb9c4365ab4f750cebbc565",
        "https://github.com/qax-os/excelize"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-248"
        ],
        "severity": "HIGH",
        "github_reviewed": true,
        "nvd_published_at": "2026-10-07T18:17:19Z",
        "github_reviewed_at": "2026-10-08T16:31:32Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-107214",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 376758,
  "published_at": "2026-10-08T16:31:32+00:00"
}