Vulnerability-Lookup

GHSA-8MCQ-6WMR-JRJV

Vulnerability from github – Published: 2026-10-07 20:23 – Updated: 2026-10-07 20:23

Summary

Excelize: a row whose earlier cell has a higher column reference than its last cell panics index out of range on almost every worksheet read API

Details

Affected versions and vulnerable location

Confirmed at ae2113b (current HEAD).
Sink: rows.go:967 ws.SheetData.Row[rowIdx].C[colNum-1] = *colData inside checkRow.
checkRow computes lastCol from the column of the last cell in document order (rows.go:940), allocates targetList of that length, then re-scatters every source cell into C[colNum-1].

Root cause

The slice is sized from the last cell's column, but cells are not required to be column-sorted in the XML. A cell that appears earlier in the row but references a higher column than the last cell has colNum-1 >= len(targetList), so the assignment writes out of range. MaxColumns/TotalRows do not help, every individual column is valid; the bug is the ordering assumption, not magnitude.

Attacker model and reachability

Any service that opens an untrusted spreadsheet and calls a worksheet API that goes through workSheetReader -> checkRow (excelize.go:332): GetCellValue, GetCellFormula, CalcCellValue, GetMergeCells, SetCellValue, and essentially every non-streaming worksheet call. (The streaming GetRows/Rows() SAX path does not trigger it.) Unauthenticated, deterministic, unrecovered panic -> process crash.

Proof of concept (executed)

Crafted xl/worksheets/sheet1.xml with a row whose cells are out of column order and whose earlier cell exceeds the last cell's column:

<row r="1"><c r="D1"><v>4</v></c><c r="C1"><v>3</v></c></row>

GetCellValue("Sheet1","A1") (via getCellStringFunc -> workSheetReader -> checkRow) panicked index out of range [3] with length 3 at rows.go:967.

Confirming grep:

rg -n "func checkRow|lastCol|Row\[rowIdx\].C\[colNum-1\]" rows.go

Suggested fix

Size targetList from the maximum cell column in the row (not the last cell in document order), or bounds-check colNum-1 against len(targetList) and grow the slice as needed before the assignment.

Severity

6.5 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/xuri/excelize/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.0"
            },
            {
              "fixed": "2.11.1-0.20260816084418-46a5eb289448"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-107221"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-07T20:23:08Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Affected versions and vulnerable location\n\n- Confirmed at `ae2113b` (current HEAD).\n- Sink: `rows.go:967` `ws.SheetData.Row[rowIdx].C[colNum-1] = *colData` inside `checkRow`.\n- `checkRow` computes `lastCol` from the column of the last cell in document order (`rows.go:940`), allocates `targetList` of that length, then re-scatters every source cell into `C[colNum-1]`.\n\n## Root cause\n\nThe slice is sized from the last cell\u0027s column, but cells are not required to be column-sorted in the XML. A cell that appears earlier in the row but references a higher column than the last cell has `colNum-1 \u003e= len(targetList)`, so the assignment writes out of range. `MaxColumns`/`TotalRows` do not help, every individual column is valid; the bug is the ordering assumption, not magnitude.\n\n## Attacker model and reachability\n\nAny service that opens an untrusted spreadsheet and calls a worksheet API that goes through `workSheetReader -\u003e checkRow` (`excelize.go:332`): `GetCellValue`, `GetCellFormula`, `CalcCellValue`, `GetMergeCells`, `SetCellValue`, and essentially every non-streaming worksheet call. (The streaming `GetRows`/`Rows()` SAX path does not trigger it.) Unauthenticated, deterministic, unrecovered panic -\u003e process crash.\n\n## Proof of concept (executed)\n\nCrafted `xl/worksheets/sheet1.xml` with a row whose cells are out of column order and whose earlier cell exceeds the last cell\u0027s column:\n\n```xml\n\u003crow r=\"1\"\u003e\u003cc r=\"D1\"\u003e\u003cv\u003e4\u003c/v\u003e\u003c/c\u003e\u003cc r=\"C1\"\u003e\u003cv\u003e3\u003c/v\u003e\u003c/c\u003e\u003c/row\u003e\n```\n\n`GetCellValue(\"Sheet1\",\"A1\")` (via `getCellStringFunc -\u003e workSheetReader -\u003e checkRow`) panicked `index out of range [3] with length 3` at `rows.go:967`.\n\nConfirming grep:\n\n```bash\nrg -n \"func checkRow|lastCol|Row\\[rowIdx\\].C\\[colNum-1\\]\" rows.go\n```\n\n## Suggested fix\n\nSize `targetList` from the maximum cell column in the row (not the last cell in document order), or bounds-check `colNum-1` against `len(targetList)` and grow the slice as needed before the assignment.",
  "id": "GHSA-8mcq-6wmr-jrjv",
  "modified": "2026-10-07T20:23:08Z",
  "published": "2026-10-07T20:23:08Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/qax-os/excelize/security/advisories/GHSA-8mcq-6wmr-jrjv"
    },
    {
      "type": "WEB",
      "url": "https://github.com/qax-os/excelize/pull/2376"
    },
    {
      "type": "WEB",
      "url": "https://github.com/qax-os/excelize/commit/46a5eb289448e40fbc7d3294589b03861fb822f0"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/qax-os/excelize"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Excelize: a row whose earlier cell has a higher column reference than its last cell panics index out of range on almost every worksheet read API"
}

CVE-2026-107221 (GCVE-0-2026-107221)

Vulnerability from cvelistv5 – Published: 2026-10-07 18:41 – Updated: 2026-10-07 19:17

Title

Excelize: a row whose earlier cell has a higher column reference than its last cell panics index out of range on almost every worksheet read API

Summary

Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.0.0 to 2.11.0, checkRow sizes its target cell slice from the last cell in XML document order and then re-scatters every cell by its explicit column reference. GetCellValue reaches workSheetReader and checkRow, where targetList is too short for an earlier out-of-order cell. When a crafted row places a higher-column cell before a lower-column final cell and a non-streaming worksheet API reads the sheet, the earlier cell's column index exceeds the slice length derived from the final cell, allowing an attacker to cause an unrecovered panic and terminate the process. No fixed version is available as of this review.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-07 19:17 UTC

CWE

CWE-787 - Out-of-bounds Write

Assigner

GitHub_M mitre root Scorecard

References

3 references

URL	Tags
https://github.com/qax-os/excelize/security/advis…	x_refsource_CONFIRM
https://github.com/qax-os/excelize/pull/2376	x_refsource_MISC
https://github.com/qax-os/excelize/commit/46a5eb2…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
qax-os	excelize	Affected: >= 2.0.0, <= 2.11.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-107221",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-07T19:17:00.546092Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-07T19:17:06.445Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/qax-os/excelize/security/advisories/GHSA-8mcq-6wmr-jrjv"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "excelize",
          "vendor": "qax-os",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.0.0, \u003c= 2.11.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.0.0 to 2.11.0, checkRow sizes its target cell slice from the last cell in XML document order and then re-scatters every cell by its explicit column reference. GetCellValue reaches workSheetReader and checkRow, where targetList is too short for an earlier out-of-order cell. When a crafted row places a higher-column cell before a lower-column final cell and a non-streaming worksheet API reads the sheet, the earlier cell\u0027s column index exceeds the slice length derived from the final cell, allowing an attacker to cause an unrecovered panic and terminate the process. No fixed version is available as of this review."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-787",
              "description": "CWE-787: Out-of-bounds Write",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-07T18:41:46.047Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/qax-os/excelize/security/advisories/GHSA-8mcq-6wmr-jrjv",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/qax-os/excelize/security/advisories/GHSA-8mcq-6wmr-jrjv"
        },
        {
          "name": "https://github.com/qax-os/excelize/pull/2376",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/qax-os/excelize/pull/2376"
        },
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          "tags": [
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          "url": "https://github.com/qax-os/excelize/commit/46a5eb289448e40fbc7d3294589b03861fb822f0"
        }
      ],
      "source": {
        "advisory": "GHSA-8mcq-6wmr-jrjv",
        "discovery": "UNKNOWN"
      },
      "title": "Excelize: a row whose earlier cell has a higher column reference than its last cell panics index out of range on almost every worksheet read API"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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    "datePublished": "2026-10-07T18:41:46.047Z",
    "dateReserved": "2026-10-07T14:34:14.816Z",
    "dateUpdated": "2026-10-07T19:17:06.445Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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