CVE-2026-78209 exceljs through 4.4.0 CSV Formula Injection via Unescaped Cell Values

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...

CVE-2026-78208

exceljs-hardened before 5.0.0 (and exceljs through 4.4.0) is affected by a path traversal vulnerability in the Workbook.addImage() function. The function fails to validate file path inputs, allowing an attacker to supply an arbitrary path that reads any file accessible to the Node.js process and ...

CVE-2026-78207

exceljs-hardened before 5.0.0 (also tracked as exceljs through 4.4.0) contains a prototype pollution vulnerability in the deepMerge helper. The helper fails to reject __proto__, constructor, or prototype keys when merging note objects, allowing an attacker to assign parsed JSON with a malicious _...

CVE-2026-78208 exceljs through 4.4.0 Path Traversal via Unvalidated addImage filename

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...

CVE-2026-78207 exceljs through 4.4.0 Prototype Pollution via deepMerge Reached From Note Serialization

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...

EUVD-2026-64682

exceljs-hardened before 5.0.0 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...

CVE-2026-78207 exceljs through 4.4.0 Prototype Pollution via deepMerge Reached From Note Serialization

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...

CVE-2026-78208 exceljs through 4.4.0 Path Traversal via Unvalidated addImage filename

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...

EUVD-2026-64683

exceljs-hardened before 5.0.0 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...

CVE-2026-78208 exceljs through 4.4.0 Path Traversal via Unvalidated addImage filename

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...

CVE-2026-78207 exceljs through 4.4.0 Prototype Pollution via deepMerge Reached From Note Serialization

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...

CVE-2026-78206 exceljs through 4.4.0 Uncontrolled Resource Consumption via Unbounded xlsx Decompression

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...

CVE-2026-78206 exceljs through 4.4.0 Uncontrolled Resource Consumption via Unbounded xlsx Decompression

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...

EUVD-2026-64681

exceljs-hardened before 5.0.0 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...

CVE-2026-78206 exceljs through 4.4.0 Uncontrolled Resource Consumption via Unbounded xlsx Decompression

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...

CVE-2026-78206

exceljs-hardened before 5.0.0 (and the upstream exceljs through 4.4.0) is vulnerable to uncontrolled resource consumption via unbounded xlsx decompression. The library decompresses all entries from supplied xlsx archives into memory without limits on entry size, total size, or compression ratio. ...

PT-2026-79799

exceljs-hardened before 5.0.0 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...

PT-2026-79802

exceljs-hardened versions before 5.0.0 fail 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...

PT-2026-79800

exceljs-hardened before 5.0.0 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...

PT-2026-79801

exceljs-hardened before 5.0.0 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...