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4 vulnerabilities found for by exceljs

CVE-2026-78209 (GCVE-0-2026-78209)
Vulnerability from cvelistv5
Published
2026-08-24 00:30
Modified
2026-08-29 11:47
Severity ?
8.4 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N
8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
CWE
  • CWE-1236 - Improper Neutralization of Formula Elements in a CSV File
Summary
exceljs through 4.4.0 fails to neutralize leading equals, plus, minus, or at signs in cell values written to CSV output. Attackers who can influence exported cell values can inject formulas that execute when the CSV file is opened in a spreadsheet application, potentially exfiltrating data or performing other malicious actions.
References
Impacted products
Vendor Product Version
exceljs exceljs Version: 0   ≤ 4.4.0
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CVE-2026-78208 (GCVE-0-2026-78208)
Vulnerability from cvelistv5
Published
2026-08-24 00:30
Modified
2026-08-29 11:47
Severity ?
8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
  • CWE-73 - External Control of File Name or Path
Summary
exceljs through 4.4.0 contains a path traversal vulnerability in the Workbook.addImage() function that fails to validate file paths. Attackers can supply arbitrary file paths to read any file accessible to the Node.js process and embed it in the generated workbook.
References
Impacted products
Vendor Product Version
exceljs exceljs Version: 0   ≤ 4.4.0
 Create a notification for this product.
Show details on NVD website

To clipboard 

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CVE-2026-78207 (GCVE-0-2026-78207)
Vulnerability from cvelistv5
Published
2026-08-24 00:30
Modified
2026-08-29 11:47
Severity ?
9.3 (Critical) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
9.4 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Summary
exceljs through 4.4.0 contains a prototype pollution vulnerability in the deepMerge helper that fails to reject __proto__, constructor, or prototype keys when merging note objects. Attackers can assign parsed JSON with a malicious __proto__ property to cell notes, modifying Object.prototype and affecting all plain objects created in the process.
References
Impacted products
Vendor Product Version
exceljs exceljs Version: 0   ≤ 4.4.0
 Create a notification for this product.
Show details on NVD website

To clipboard 

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CVE-2026-78206 (GCVE-0-2026-78206)
Vulnerability from cvelistv5
Published
2026-08-24 00:30
Modified
2026-08-29 11:47
Severity ?
8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Summary
exceljs through 4.4.0 decompresses all entries from supplied xlsx archives into memory without limits on entry size, total size, or compression ratio. Attackers can upload highly compressed workbooks that expand to gigabytes in memory, exhausting available resources and causing denial of service.
References
Impacted products
Vendor Product Version
exceljs exceljs Version: 0   ≤ 4.4.0
 Create a notification for this product.
Show details on NVD website

To clipboard 

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                  "versionEndIncluding": "4.4.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Mat\u00e9o Florian Callec"
        }
      ],
      "datePublic": "2026-08-23T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "exceljs through 4.4.0 decompresses all entries from supplied xlsx archives into memory without limits on entry size, total size, or compression ratio. Attackers can upload highly compressed workbooks that expand to gigabytes in memory, exhausting available resources and causing denial of service."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-409",
              "description": "Improper Handling of Highly Compressed Data (Data Amplification)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-29T11:47:57.243Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/exceljs/exceljs"
        },
        {
          "name": "GitHub Security Advisory (GHSA-7cvf-3r55-r39q)",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-7cvf-3r55-r39q"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/exceljs/exceljs/blob/v4.4.0/lib/xlsx/xlsx.js#L257-L281"
        },
        {
          "name": "VulnCheck Advisory: exceljs through 4.4.0 Uncontrolled Resource Consumption via Unbounded xlsx Decompression",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/exceljs-through-uncontrolled-resource-consumption-via-unbounded-xlsx-decompression"
        }
      ],
      "title": "exceljs through 4.4.0 Uncontrolled Resource Consumption via Unbounded xlsx Decompression",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-78206",
    "datePublished": "2026-08-24T00:30:46.462Z",
    "dateReserved": "2026-08-24T00:15:01.655Z",
    "dateUpdated": "2026-08-29T11:47:57.243Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}